Christopher DeCoste defended Katherine Magbanua by challenging the investigation's reliance on Luis Rivera and the inferences drawn from financial, phone, wiretap, and employment evidence. In closing, he argued that the State had proved the homicide but not Magbanua's knowing involvement; jurors later deadlocked on every charge against her, and Judge Hankinson declared a mistrial as to her.
Christopher DeCoste

Defense attorney for Katherine Magbanua in both the 2019 Garcia–Magbanua joint trial and the 2022 Magbanua retrial.
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Christopher DeCoste represented Katherine Magbanua in her 2019 joint trial and 2022 retrial. He questioned investigators, analysts, forensic witnesses, and Rivera about cooperation benefits, changing recollections, unrecorded interviews, investigative gaps, and assumptions underlying trajectory, cell-site, financial, and surveillance evidence. He emphasized that phone records could not establish precise locations or communication content, that financial reviews could not identify every cash source or exclude nightclub income, and that physical evidence did not establish why Markel’s arm was raised. DeCoste also examined defense witnesses, introduced maps, call records, bank excerpts, and text messages, and litigated the permitted uses of Apple records, wiretap calls, and undercover recordings. In the 2019 closing, he argued that proof of the homicide did not itself prove Magbanua’s knowing involvement; the jury later deadlocked on all charges against her, and Judge Hankinson declared a mistrial. At her 2022 retrial, jurors found Magbanua guilty on all three counts.
Trial Record (225)
Christopher DeCoste cross-examined key State witnesses for the defense, focusing on Luis Rivera's changing recollections and cooperation, the limits of phone-location analysis, and alternative explanations for financial and recorded evidence. He also examined defense witnesses and preserved hearsay, discovery, and recording objections while the court made separate admissibility rulings.
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