Commonwealth v. Read — Trial Archive
Trial 2 Trial Day
◀ Day 27 Trial 2 Day 29 ▶

Day 28 - June 6, 2025

Judge Beverly J. Cannone · Trial 2 · 3 proceedings · 2,334 lines

Day 28 of 36
Appearing:
🏛️ Hank Brennan 🛡️ Alan Jackson 🔬 Daniel Wolfe

Defense accident reconstruction expert Daniel Wolfe testifies that tail light damage is inconsistent with striking O'Keefe, while prosecution cross-examination attacks his methodology and communications with defense counsel.

Full day summary

Day 28 consisted entirely of the testimony of Daniel Wolfe, ARCCA's director of accident reconstruction, called by the defense to rebut the Commonwealth's vehicle-strike theory. On direct, Wolfe presented results from six impact tests — laboratory and full-scale — concluding to a reasonable degree of scientific certainty that the damage to Karen Read's Lexus tail light was inconsistent with striking John O'Keefe's arm or body at any tested speed, and that no test reproduced hoodie puncture damage or diffuser failure matching the subject vehicle. ADA Brennan's cross-examination focused on two fronts: a communications scandal involving Wolfe deleting approximately 100 texts with Jackson and switching to encrypted Signal at the defense's direction, and a methodological attack centered on Wolfe's use of a crash dummy arm weighing 26% less than O'Keefe's estimated arm weight. On redirect, Jackson challenged the weight criticism by eliciting that O'Keefe's arm was never actually weighed and that the 11.86-pound figure was an estimate; Wolfe testified that increased vehicle speed added kinetic energy that, in his opinion, would overcome a one- to two-pound arm-mass difference. The court recessed for the weekend.

Key Moments
  • Wolfe presents six impact tests showing tail light damage in every scenario exceeded the subject Lexus's actual damage, concluding the vehicle-strike theory is physically inconsistent.
  • Wolfe testifies he deleted approximately 100 text messages with Jackson after Trial 1, then switched to encrypted Signal at Jackson's suggestion — the first time he used Signal with any client.
  • Brennan establishes Wolfe used a crash dummy arm weighing 9.38 pounds when O'Keefe's estimated arm weight was 11.86 pounds, a 26% discrepancy, with a closer 12-pound arm available but unused.
  • Brennan pressed Wolfe to name literature supporting his clothing-tear and abrasion opinions; Wolfe replied that he had cited none in his report.
  • On redirect, Jackson elicits that tail light debris moving at common velocity with the arm cannot physically accelerate enough to penetrate the sweatshirt, undermining the prosecution's fragment theory.
Notable Quotes
Hank Brennan
“Name one journal, one paper, one study that supports your proposition that you're relying on as the basis of your opinion in front of this jury today. Name one.”
Brennan pressed Wolfe to identify supporting literature for his clothing and abrasion opinions; Wolfe replied that he had cited none in his report, framing a central credibility dispute on cross-examination.
Hank Brennan
“Why did you invite somebody else to interject in your independence and guide you to leave something out?”
Brennan challenged Wolfe's independence by asking why he invited defense input about omitting a background statistic. Wolfe said the wording was intended to avoid confusing the jury and that he did not omit the point.
Daniel Wolfe
“They would have to be going faster. If they're moving at a common velocity with the arm, relative to it, they would somehow have to accelerate with more speed to catch up and go beyond the arm essentially.”
Wolfe's physics explanation on redirect — that debris moving at common velocity with the arm cannot cut through it — provides the defense's clearest rebuttal to the prosecution's fragment-puncture theory.
Video thumbnail for Day 28 — Wolfe 7h 13m
Watch this day Day 28 — Wolfe Watch with synced transcript →

Daniel Wolfe — Direct

Daniel Wolfe's six ARCCA impact tests, spanning 10–29 mph, found the Lexus tail-light damage inconsistent with an arm or full-body pedestrian impact; clothing results varied by configuration.

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Direct
Daniel Wolfe Alan Jackson
1238 lines

Daniel Wolfe, ARCCA's director of accident reconstruction, testified on direct examination by Alan Jackson about extensive testing he conducted to evaluate whether the damage to Karen Read's Lexus tail light was consistent with striking John O'Keefe's arm. Wolfe described his qualifications, his original independent retention by the DOJ/FBI, and his subsequent engagement by the defense to review Dr. Welcher's reports. He presented a PowerPoint walking through six impact tests — two laboratory tests (10 and 17 mph) using a linear impactor, and four full-scale vehicle tests (15, 24, and 29 mph) using suspended ATD arms and a Rescue Randy dummy. In every test, the tail light damage was less severe than the subject vehicle's damage, and internal diffusers remained largely intact. Clothing results varied: Test F's full-body strike produced widespread road rash and holes in many locations, which Wolfe distinguished from O'Keefe's localized sleeve defects. Wolfe criticized Dr. Welcher's work for lacking force calculations, acceleration measurements, speed analysis, or dynamic impact testing beyond a 2 mph paint transfer demonstration. Wolfe concluded to a reasonable degree of scientific certainty that the tail light damage was inconsistent with striking an arm or a pedestrian's center of mass.

Daniel Wolfe — Cross

Brennan questioned Wolfe on defense communications, independence, and ARCCA methods. He said texts were deleted, would not call Q&A a script, and said weight can matter but qualified its effect; test limits, not reliability, were disputed.

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Cross
Daniel Wolfe Hank Brennan
1009 lines

ADA Hank Brennan conducted an extensive cross-examination of ARCCA director Daniel Wolfe, questioning his independence and crash-testing methodology. Wolfe stated that the earlier text-message chain had already been deleted by the time he received the court order. Brennan also questioned Wolfe about anticipated Q&A material; Wolfe said he would not characterize it as a script. On methodology, Brennan focused on the difference between the Hybrid III test arm and O'Keefe's estimated arm weight and pressed claimed limitations in the crash tests. Wolfe agreed that weight can matter, but stated that its effect could not be assessed in isolation from what would happen to the body and injuries in a 24-mph impact. The exchange presented competing positions about the significance of the testing rather than resolving the reliability of Wolfe's opinions.

Daniel Wolfe — Redirect

On redirect, Jackson used Wolfe's conditional debris-velocity testimony, Test F damage comparison, and arm-weight qualifications to revisit Brennan's cross, with additional glass and ARCCA topics before the weekend recess.

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Redirect
Daniel Wolfe Alan Jackson
87 lines

On redirect, Jackson walked Wolfe back through the Test E video (24 mph reverse impact) to establish that tail light debris could not physically accelerate fast enough to penetrate the sweatshirt — fragments moving at common velocity with the arm cannot catch up and cut through it. Jackson then addressed the Test F sweatshirt damage, eliciting that the full-body road rash and widespread holes from the dummy launch were distinctly different from the nine small puncture holes on O'Keefe's right sleeve. Jackson challenged the arm weight criticism central to Brennan's cross, establishing that O'Keefe's actual arm was never weighed and the 11.86-pound figure was a statistical estimate, and that the 2.5-pound difference was immaterial given that increasing vehicle speed to 29 mph exponentially increased kinetic energy far beyond any mass differential. The court recessed for the weekend with the judge asking jurors to consider staying a full day the following Thursday.

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