Person Jessica Hyde Trial 1Trial 2Digital-forensics examiner who testified about disputed phone-search and device records. ← All People
🔬 Expert Witness · Magnet Forensics

Jessica Hyde

Courtroom still of Jessica Hyde.

Digital-forensics examiner who testified about disputed phone-search and device records.

Trial 1Trial 2
634 lines 7 proceedings 2 trials

About

Jessica Hyde, a digital-forensics examiner affiliated with Magnet Forensics, analyzed an extraction from a phone identified to her as Jennifer McCabe’s. She testified that a 2:27 a.m. Safari browser-state timestamp reflected tab activity, not necessarily when the disputed search was made. She placed that search at approximately 6:24 a.m. and said she found no evidence that its artifacts were user-deleted. She also attributed the removal of older call-log entries to the phone’s operation rather than user action. Defense counsel challenged the foundation and scope of Hyde’s analysis. She said her initial review was limited to Safari search history under instructions relayed by Detective Tully. At the retrial, she explained that Cellebrite had removed the disputed timestamp from automated reporting while the underlying data remained; she agreed that Axiom still displayed it. The court allowed her testimony after finding her qualified as a digital-forensics expert. Questioned about John O’Keefe’s phone, Hyde acknowledged that she had not reviewed one artifact raised by defense counsel. She explained that health-app step entries reflect device motion, not necessarily steps taken by a person, and said her report did not identify the cause of later motion. She agreed that the phone had not been isolated according to the preservation practice she described, while saying the additional data it received did not otherwise affect her conclusions.

Trial Record (7)

Trial 1 First Criminal Trial Apr 29, 2024 – Jul 1, 2024 2 proceedings

Day 25

Direct Jessica Hyde Direct Examination Jessica Hyde Adam Lally 4 highlights 108 lines spoken
Summary

Jessica Hyde testified about Safari search artifacts, stating that a 2:27 browser-state timestamp did not establish the search time and that she found no evidence of deletion.

Highlights (4)
Quote

“My conclusion is that there was a search at 0247 a.m. for Hockomock Sports, that that browser was in use, and there were continual searches due through the night.”

Hyde stated her timeline conclusion before distinguishing the later search entries.

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Quote

“In regards to those artifacts pertaining to those search terms, I had no evidence of deletion.”

Hyde gave her direct conclusion on whether the search-term artifacts showed deletion.

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Key Moment

Hyde explained that the browser-state timestamp reflects tab activity rather than necessarily the time a search was made, while describing the two searches she identified at 6:23 and 6:24 a.m.

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Cross Jessica Hyde Cross-Examination on Phone Search Timeline and Review Scope Jessica Hyde David Yannetti 4 highlights 25 lines spoken
Summary

Hyde said the 2:27 a.m. timestamp did not indicate search time and that her review was limited to Safari search history.

Highlights (4)
Quote

“That timestamp is not indicative of a time of search. So the question is difficult to answer, because I can't say that that timestamp tells me anything about the time of search.”

Hyde distinguished the tab timestamp from evidence of when a search occurred.

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Key Moment

Hyde maintained that the 2:27 a.m. timestamp was associated with a tab, not a Google-search time, and said the extraction gave no indication of a search at or before that time.

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Trial 2 Retrial Apr 22, 2025 – Jun 18, 2025 5 proceedings

Day 11

Direct Jessica Hyde — Direct Examination Jessica Hyde Hank Brennan 6 highlights 121 lines spoken
Summary

Jessica Hyde testified that a Safari tab timestamp did not mark when the "hos long to die in cold" search was made, placing it at about 6:24 a.m.; she also opined that neither the search nor older call-log entries were user-deleted.

Highlights (6)
Quote

“What I can state to a scientific degree of certainty is that that search occurred at 6:24 a.m., and was the last search in the tab that had been opened at 2:27.”

Hyde gave her central opinion on the disputed search timing.

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Quote

“My opinion is there was no deletion that occurred by the user because it is not something a user can delete.”

Hyde stated her opinion that the Safari item was not user-deleted.

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Quote

“The opinion is that I can see that it's done by the device itself utilizing the unified logs, that the system is deleting the 201st every time a new call is received or outgoing.”

Hyde attributed removal of older call-log entries to the device's system behavior rather than user action.

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Show 2 more
Cross Ms. Hyde Cross-Examination: Phone Data and Timestamp Analysis Jessica Hyde Robert Alessi 3 highlights 292 lines spoken
Summary

Defense challenged Ms. Hyde's reports on phone activity, the 2:27:40 timestamp, and evidence handling; she acknowledged limits in artifacts she had not reviewed and agreed that the phone was not isolated according to the preservation practice she described.

Highlights (3)
Quote

“I cannot contest it because I do not recall looking at that specific artifact.”

Ms. Hyde said she had not reviewed the artifact defense used to question the timing in her report.

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Quote

“Cellebrite did remove that time stamp from the tool, that is correct.”

Ms. Hyde acknowledged a change in Cellebrite's automated reporting of the disputed timestamp.

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Quote

“Correct. It is not in accordance with the best practices. I agree. I would have Faradayed it.”

Ms. Hyde agreed that the phone handling reflected in the data did not follow the preservation practice she described.

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Redirect Jessica Hyde - Redirect Jessica Hyde Hank Brennan 2 highlights 52 lines spoken
Summary

Hyde defended the independence and methodology of her phone analysis, explained limits on timestamp and health-step data, and said her report could not establish all overnight phone movement.

Highlights (2)
Recross Jessica Hyde - Recross Jessica Hyde Robert Alessi 4 highlights 36 lines spoken
Summary

Hyde answered further questions about timestamp tools, phone isolation, and call-log data, saying Mr. O'Keefe's phone appeared not to have been in a Faraday bag from 6:00 a.m. to noon.

Highlights (4)
Quote

“I analyzed her phone to see if there had been deletions of call logs and what I found was that there were records that were removed by the system and not recoverable from that database but were recoverable from biomes.”

Hyde distinguished system-removed call-log records from recoverable data found in another source.

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Key Moment

Hyde testified that the phone identified as Mr. O'Keefe's appeared to have received signal from 6:00 a.m. to noon and not to have been placed in a Faraday bag, subject to her stated qualification about a potentially failing bag.

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