Cross-examined investigators and technical witnesses about wiretap coverage, recording practices, investigation records, cash and employment documentation, and cell-tower limitations.
Christopher DeCoste

Defense attorney for Katherine Magbanua in both the 2019 Garcia–Magbanua joint trial and the 2022 Magbanua retrial.
About
DeCoste’s work helps identify the defense’s examination of technical, documentary, and cooperating-witness evidence for Katherine Magbanua across both trials.
Christopher DeCoste served as defense co-counsel for Katherine Magbanua in the Garcia–Magbanua 2019 Joint Trial and magbanua-retrial-2022. He conducted cross-examinations aimed at testing witness accounts, investigative documentation, technical evidence, and the inferences drawn from financial, employment, wiretap, and phone-record evidence. His questioning addressed Luis Rivera’s prior statements and cooperation-related evidence, the handling and content of investigative records, and the limits of using cell towers and call-detail records to infer a phone’s location. He also examined witnesses including Agent Patrick Sanford and Detective Craig Isom, conducted the direct examination of Jason Newlin, and in the 2019 joint trial delivered Magbanua’s closing argument under the reasonable-doubt standard.
Attorney insights (9)
Garcia–Magbanua
In closing, argued that the evidence established Markel's murder but not Magbanua's involvement, asking jurors to assess reasonable doubt separately as to her.
Supporting record (1)
Questioning challenged the reliability and documentation of Luis Rivera's account, including the unrecorded September 30 proffer and details absent from Isom's report.
Supporting record (2)
Questioning framed financial and cell-site evidence as capable of explanations other than the State's proposed inference.
Supporting record (2)
Magbanua Retrial
Cross-examined Luis Rivera on prior statements, recollection, the claimed third Tallahassee trip, and Rivera's account of Katherine Magbanua's involvement.
Supporting record (1)
Cross-examined Christopher Corbitt on the limits of handset-location analysis and filtered call summaries; Defense Exhibits 10 through 17 were admitted.
Supporting record (1)
Conducted or was assigned cross-examination and recross of several witnesses, including Joanne Maltese, Ramzi Naber, Louis Bronstein, and Patrick Sanford, and direct examination of Jason Newlin.
Questioned Luis Rivera about changed recollections, prior statements, the number of guns, the disposal of a gun, and an asserted alternative motive involving Sigfredo Garcia's jealousy.
Supporting record (1)
Tested whether cell-site and call-detail analysis established exact locations or supported the proposed travel and communication inferences.
Supporting record (1)
Trial Record (223)
Defense co-counsel for Katherine Magbanua, DeCoste challenged the investigation's technical, financial, and witness evidence and delivered her closing argument.
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Serving as defense co-counsel, Christopher DeCoste examined witnesses and pursued challenges to Luis Rivera's prior accounts and to the limits of cell-site analysis.
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