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Dan Markel— Case Archive
personpersonChristopher CorbittChristopher CorbittTallahassee Police Department sergeant and cell-site analyst who testified as the State's phone-records expert in all four Markel-murder trials.← All People
Expert witness· Tallahassee Police Department

Christopher Corbitt

Courtroom still of Christopher Corbitt.

Tallahassee Police Department sergeant and cell-site analyst who testified as the State's phone-records expert in all four Markel-murder trials.

AppearedGarcia–MagbanuaMagbanua RetrialCharlie AdelsonDonna Adelson
4,890 lines·80 proceedings·14 mentions·4 trials

About

His testimony provides a consistent technical foundation for understanding how communications, travel, and wiretap records were introduced across four related trials, including the limits of those records.

Christopher Corbitt, a Tallahassee Police Department sergeant and technical-operations supervisor, testified as a historical communications-record analyst in four related trials. He explained phone and call-detail records, cell-site and tower-dump evidence, rental and GPS materials, and wiretap procedures used to examine travel and communications connected to the June and July 2014 events. His testimony consistently described cell-site evidence as capable of showing whether a handset was consistent with a general coverage area, rather than establishing an exact location or identifying the handset user. He also addressed the limits of historical records, including unavailable or filtered communications, duplicate or routed entries, records without location events, and communications occurring through other channels. In the later proceedings, his testimony also covered iCloud, extracted-phone, and WhatsApp records, including selected message material and related travel or visa communications. Under cross-examination, he acknowledged the limits of the underlying records and the possible alternative interpretations of some patterns, while redirect examination addressed record timing, methodology, and the scope of his conclusions.

Trial Record (80)

GMGarcia–MagbanuaSep 26, 2019 – Oct 11, 2019Called by prosecution and defense

Testified as a Tallahassee Police Department technical-operations supervisor about phone, cell-site, GPS, iCloud, and wiretap records, while explaining both their investigative use and their limits.

Day 3

DirectChristopher Corbitt - DirectChristopher CorbittAnna Norris2highlights163lines spoken

Summary

Corbitt explained the phone-record and tower-dump analysis that identified Garcia's number and showed Magbanua as his most frequent contact, while stressing that cell-site analysis provides only a general location.

Highlights (2)

testimony highlightCorbitt described his analysis of Wendi Adelson's reported route, an ABC Liquor receipt, and phone records to estimate when she encountered the Trescott Drive roadblock.Open in transcript →
Quote“well, what we found was the most frequently contacted number was the (786)564-1312 of Ms. Magbanua.”— Christopher CorbittCorbitt identified Magbanua's number as the most frequent contact in Garcia's May-to-July 2014 phone-record analysis.Open in transcript →

Day 4

Day 5

DirectChristopher Corbitt - DirectChristopher CorbittAnna Norris1highlight131lines spoken

Summary

Corbitt mapped June and July phone, rental, and GPS records, while the court addressed defense complaints about late-disclosed demonstrative material.

Highlights (1)

Quote“we did. The Comfort Rent-A-Car was equipped with a tracking device that provided location information on a periodic basis. And that location information for the morning of June 5th shows it consistent with the parking lot of the Budget Inn.”— Christopher CorbittCorbitt described GPS information that the State compared with the phone-location analysis.Open in transcript →Watch this moment ▶
DirectChristopher Corbitt - Direct (Recall, Part 2)Christopher CorbittAnna Norris1highlight179lines spoken

Summary

Corbitt mapped July travel, handset locations, and call activity through phone, GPS, bank, and video records, while explaining limits in the available data.

Highlights (1)

Quote“Again, from the video, we can see the time that Mr. Markel departs, 10:38 a.m. The Prius departs immediately after; again, 10:38 a.m.”— Christopher CorbittConnects the rental vehicle's departure time to Markel's departure from Premier Health & Fitness.Open in transcript →Watch this moment ▶

Day 6

CrossChristopher Corbitt - Cross (Continued)Christopher CorbittChristopher DeCoste2highlights108lines spoken

Summary

Corbitt acknowledged limits in the available cell-site records as the defense introduced a Cellebrite timeline and explored alternative communication methods.

Highlights (2)

Quote“As you move away from the tower, that energy is radiating out in the opposite direction that you are so your handset's not going to reach around and talk to it.”— Christopher CorbittCorbitt explained why a handset ordinarily communicates with a sector oriented toward its general area, while distinguishing that from an exact location determination.Open in transcript →Watch this moment ▶
testimony highlightCorbitt agreed that the investigation did not have records showing Miami tower traffic limits or whether relevant towers or sectors were down on the dates at issue.Open in transcript →Watch this moment ▶

Day 7

DirectChristopher Corbitt - DirectChristopher CorbittAnna Norris2highlights29lines spoken

Summary

Corbitt explained wiretap monitoring, minimization, and recording procedures as the court allowed testimony about code talk in deciding whether to minimize calls.

Highlights (2)

Quote“Once we hit that button, that, that voice is no longer being recorded.”— Christopher CorbittCorbitt described the stated effect of minimizing a wiretapped call.Open in transcript →
rulingThe court overruled defense objections to testimony about code talk, ruling that Corbitt could explain how monitors decide whether to minimize a call.Open in transcript →

Day 8

Day 9

Day 10

KMMagbanua RetrialMay 18, 2022 – May 27, 2022Called by prosecution

TPD Sergeant Christopher Corbitt presented technical phone, cell-site, travel, and wiretap evidence, while repeatedly limiting cell-site conclusions to coverage areas rather than exact handset locations. Defense questioning tested those limits and the proposed iCloud contact association; redirect clarified record timing and interpretation.

Day 1

Day 2

Day 3

DirectChristopher Corbitt - DirectChristopher CorbittSarah Kathryn Dugan3highlights430lines spoken

Summary

Corbitt presented cell-phone, tower-dump, GPS, and rental-record analysis, while emphasizing that cell-site data shows coverage consistency rather than an exact handset location. The court admitted the main summary exhibit subject to objections and instructed jurors to disregard one disputed phone-number attribution.

Highlights (3)

testimony highlightCorbitt explained that cell-site analysis can establish whether a location is included in a sector's coverage area, but cannot place a handset at an exact spot.Open in transcript →
Quote“I cannot say exactly where a handset is. with the records that we have and that information, there is no way for me to say with certainty that that handset was in the parking lot of Premier Health and Fitness.”— Christopher CorbittStates the central limitation of the location analysis while explaining why the testimony uses consistency rather than precise placement.Open in transcript →
testimony highlightCorbitt described the court-authorized wiretap process, including real-time interception, minimization, supervisory review, and storage of recordings.Open in transcript →
profferChristopher Corbitt - Defense Proffer ExaminationChristopher CorbittChristopher DeCoste2highlights38lines spoken

Summary

Corbitt said he could not conclusively link the "Tato" contact label to Luis Rivera or determine the source of differences in Apple-related records.

Highlights (2)

Quote“All I can say is, the information that I have in front of me right here, I cannot determine one way or the other.”— Christopher CorbittCorbitt acknowledged that the record before him did not permit him to determine the source of the formatting differences.Open in transcript →Watch this moment ▶

Day 4

CrossChristopher Corbitt - CrossChristopher CorbittChristopher DeCoste2highlights590lines spoken

Summary

Defense cross-examination emphasized that cell-site records show handset coverage consistency rather than exact locations, challenged filtered call summaries, and introduced maps and color-coded call records as Defense Exhibits 10 through 17.

Highlights (2)

Quote“That's correct. I hope I've been clear that with the cell site we are looking at including and excluding addresses. I'm never trying to say that a handset was at one particular address.”— Christopher CorbittCorbitt stated the central limitation of his cell-site analysis.Open in transcript →Watch this moment ▶
CrossChristopher Corbitt - Cross (Continued)Christopher CorbittChristopher DeCoste1highlight30lines spoken

Summary

Corbitt clarified wiretap logging, recording, and minimization procedures as the defense explored app-based communications and limits of the records.

Highlights (1)

Quote“But these are the exact same records that we would get if we asked for the historical call details. So we do have a record of every phone call, every text message, every location, just as if we had those historical records.”— Christopher CorbittCorbitt distinguished the real-time wiretap data from the separate question of whether every call was recorded.Open in transcript →Watch this moment ▶
RedirectChristopher Corbitt - RedirectChristopher CorbittSarah Kathryn Dugan2highlights143lines spoken

Summary

Corbitt clarified phone and cell-site records, described July 19 location inferences, and the court admitted two State exhibits while allowing limited prior-testimony audio.

Highlights (2)

testimony highlightCorbitt described Rivera's handset as moving toward the area of Garcia's residence and then returning toward Rivera's residence area during the July 19 communications.Open in transcript →
Quote“He could be there sooner. I have events at 10:23 with location. And then the next that I have shown here is 10:34. So sometime in that time frame, in that window, he became consistent with the area around his house.”— Christopher CorbittCorbitt qualified the timing inference by identifying the gap between the two location events.Open in transcript →Watch this moment ▶
CACharlie AdelsonOct 26, 2023 – Nov 6, 2023Called by prosecution

On Days 3 and 4, Tallahassee Police Sergeant Christopher Corbitt presented historic communications and cell-site analysis, then answered defense questions about the records' limits and the interpretation of handset-location evidence.

Day 3

DirectChristopher Corbitt - DirectChristopher CorbittSarah Kathryn Dugan2highlights456lines spoken

Summary

Corbitt presented the State's phone, location, rental, and extracted-device records, while explaining the limits of historical cell-site analysis.

Highlights (2)

Quote“we can only make estimations about locations when we have events with location.”— Christopher CorbittCorbitt stated the central limitation of his cell-site analysis.Open in transcript →Watch this moment ▶

Day 4

CrossChristopher Corbitt - CrossChristopher CorbittDan Rashbaum2highlights400lines spoken

Summary

Defense cross-examined Corbitt on the limits and interpretation of phone and cell-site evidence; the court also limited use of unadmitted texts and allowed a defense chart only as a demonstrative.

Highlights (2)

Quote“We don't have any recordings of those. So we don't know what was said during those communications.”— Christopher CorbittCorbitt confirmed that the call records did not reveal the substance of the conversations.Open in transcript →
RedirectChristopher Corbitt - RedirectChristopher CorbittSarah Kathryn Dugan2highlights64lines spoken

Summary

Corbitt clarified duplicate-call methodology, a corrected message attribution, and the limits of cell-site evidence; the court sustained a speculation objection during redirect.

Highlights (2)

testimony highlightCorbitt explained that duplicate records were removed from individual call summaries and patterns, while frequency reports could still include duplicates.Open in transcript →Watch this moment ▶
Quote“For all of the call summaries, I went and looked at each call and looked at the recipient's records to see if there were indications of voice mail, routing, and did my best effort to remove anything that was not an individual, completed, actual communication.”— Christopher CorbittCorbitt described how he addressed the defense's concern about duplicated call records in the presentation.Open in transcript →Watch this moment ▶
DADonna AdelsonAug 22, 2025 – Sep 4, 2025Called by prosecution

Testified as the State's historical communication-record analyst, correlating phone, cell-site, GPS, and message records while explaining the limits of location and call-frequency analysis. Recalled on Day 6 to authenticate selected message records and describe WhatsApp material recovered from Donna Adelson's phone.

Day 3

DirectChristopher Corbitt - DirectChristopher CorbittSarah Kathryn Dugan3highlights236lines spoken

Summary

Cell-site analyst Christopher Corbitt explained the limits of phone-location analysis and presented certified phone records, tower-dump results, and family communications.

Highlights (3)

Quote“And historical location analysis is about inclusion and exclusion. And we look at a location, and we say, yes, this address is included in the service area -- based on our opinion, is included in the service area of this particular cell site and sector. Or, no, a handset at the location you gave me would not be serviced by this particular cell site and sector. So we include and exclude locations. we do not say exactly where a handset was.”— Christopher CorbittCorbitt stated the limits of his cell-site methodology while explaining how it could be used to assess proposed locations.Open in transcript →Watch this moment ▶

Day 4

DirectChristopher Corbitt - Direct (Continued)Christopher CorbittSarah Kathryn Dugan3highlights396lines spoken

Summary

Cell-site analyst Christopher Corbitt traced phone, GPS, rental, and message records through the June and July 2014 trips and the aftermath of Dan Markel's killing.

Highlights (3)

testimony highlightCorbitt used rental, cell-site, and call records to describe the June rental trip, including Magbanua's handset being consistent with the rental-car area and subsequent calls involving Charlie Adelson and the Adelson residence.Open in transcript →Watch this moment ▶
testimony highlightCorbitt traced the July rental and travel records, the communications on the morning of July 18, and the later return of Garcia's handset to the network before a call to Magbanua.Open in transcript →Watch this moment ▶
Quote“the distance traveled is not consistent with the time consumed.”— Christopher CorbittCorbitt gave the limited conclusion of his route-and-cell-site timing analysis rather than identifying a specific stop from the records alone.Open in transcript →
sidebarPrior Testimony and Adoptive Admission

Summary

The parties disputed whether a witness could address Charlie Adelson’s prior testimony and whether Donna Adelson’s later messages could be treated as an adoptive admission.

CrossChristopher Corbitt - CrossChristopher CorbittJoshua D. Zelman2highlights161lines spoken

Summary

Corbitt agreed that cell-site records cannot precisely locate a handset and could not place Donna Adelson's handset at Charlie Adelson's residence; he also explained limits in call-count and travel-timing analysis.

Highlights (2)

testimony highlightCorbitt explained that mapped points identify the cell site communicating with a handset, not the handset's precise location, and agreed that the analysis cannot determine exactly where a handset was.Open in transcript →Watch this moment ▶
Quote“It certainly has limitations as far as nothing in the analysis that I have done is meant to say exactly where a handset is. We are unable to do that.”— Christopher CorbittCorbitt directly described the central limit of his cell-site analysis.Open in transcript →Watch this moment ▶
RedirectChristopher Corbitt - RedirectChristopher CorbittSarah Kathryn Dugan2highlights16lines spoken

Summary

Corbitt clarified his text-message, drive-timing, and cell-site opinions, saying his drive test matched estimated travel times and the records did not undermine his analysis.

Highlights (2)

Quote“I believe the "outside your house" text message is indicative of her being outside his house.”— Christopher CorbittCorbitt stated his interpretation of the text message's location reference.Open in transcript →Watch this moment ▶

Day 6

DirectChristopher Corbitt - Direct (Recall)Christopher CorbittSarah Kathryn Dugan3highlights219lines spoken

Summary

Corbitt presented message and phone-record evidence concerning the extortion account, WhatsApp communications, and post-verdict Vietnam visa and travel-related records.

Highlights (3)

Quote“Sure. Hi, Daisy. I'm trying to get a fast-track emergency visa for Vietnam.”— Christopher CorbittCorbitt read a message from the visa chat that the State introduced through the phone extraction.Open in transcript →
testimony highlightCorbitt described records reflecting a November 7 search concerning United States extradition treaties and an emergency Vietnam visa chat beginning the same day.Open in transcript →
RedirectChristopher Corbitt - Redirect (Recall)Christopher CorbittSarah Kathryn Dugan1highlight24lines spoken

Summary

Corbitt clarified the timing of a 2016 article, described urgency in visa-related communications, and the court admitted the Spireon GPS certification without objection.

Highlights (1)

Quote“Yes. There was urgency in every -- all the communications and getting things done, getting the visa, there seemed to be a sense of urgency to that.”— Christopher CorbittCorbitt described the urgency he perceived in the visa-related communications.Open in transcript →Watch this moment ▶

Day 7

Day 9