Commonwealth v. Read — Trial ArchiveNicholas Guarino
Trooper Nicholas Guarino is a Massachusetts State Police digital forensics examiner who testified in both trials about phone extractions, GPS data, call logs, text messages, and health data from devices belonging to John O'Keefe, Karen Read, Kerry Roberts, and Jennifer McCabe. His testimony covered the timeline of Read's movements on the night of January 28–29, 2022, and directly rebutted defense expert Richard Green's analysis of McCabe's phone data. In Trial 1 he also addressed the failed extraction of Read's Lexus infotainment system and presented velocity calculations arguing O'Keefe could not have entered 34 Fairview during a brief GPS anomaly window.
Trial 1 vs Trial 2
In Trial 2, Guarino's direct examination was spread across three days and structured more methodically — beginning with his forensic background and extraction methodology before moving to the phone data itself, suggesting the prosecution refined its presentation after Trial 1's cross revealed vulnerabilities in how his findings were introduced. Trial 2 placed greater emphasis on the chronological PowerPoint of Read's calls, texts, and voicemails through the early morning hours, while the extended rebuttal of Green's defense report that dominated Guarino's Trial 1 Day 26 testimony was not replicated in Trial 2 in the same form.