Karen Learn protection calls remaining witness as Boston cop loss of life trial nears finish

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Karen Read's protection has known as the knowledgeable believed to be its remaining witness as her trial within the loss of life of Boston cop John O'Keefe, which started again in April, nears an in depth.

Prosecutors allege that Learn, after an evening out consuming, rammed O'Keefe in reverse along with her Lexus and left him to die outdoors a home occasion throughout a record-setting blizzard on Jan. 29, 2022.

Dr. Andrew Rentschler testified briefly Tuesday afternoon and is anticipated to return to the stand for at the very least half a day Wednesday earlier than the protection rests.

KAREN READ REVEALS SHE WILL NOT TESTIFY IN HER OWN DEFENSE

<source media="(min-width: 768px) and (max-width: 1023px)" srcset="https://a57.foxnews.com/static.foxnews.com/foxnews.com/content/uploads/2025/06/672/378/karen-read-boston-ma-retrial-john-okeefe-day-31-030.jpg?ve=1&tl=1, https://a57.foxnews.com/static.foxnews.com/foxnews.com/content/uploads/2025/06/1344/756/karen-read-boston-ma-retrial-john-okeefe-day-31-030.jpg?ve=1&tl=1 2x" height="378" width="672"><source media="(min-width: 1024px) and (max-width: 1279px)" srcset="https://a57.foxnews.com/static.foxnews.com/foxnews.com/content/uploads/2025/06/931/523/karen-read-boston-ma-retrial-john-okeefe-day-31-030.jpg?ve=1&tl=1, https://a57.foxnews.com/static.foxnews.com/foxnews.com/content/uploads/2025/06/1862/1046/karen-read-boston-ma-retrial-john-okeefe-day-31-030.jpg?ve=1&tl=1 2x" height="523" width="931"> Karen Learn talks along with her lawyer, Alan Jackson, throughout her retrial, Tuesday, June 10, 2025, in Dedham, Mass. (Matt Stone/The Boston Herald by way of AP, Pool)

He's the second witness from the crash reconstruction agency ARCCA, which now works for the protection however had been retained by the federal authorities forward of Learn's first trial, which ended with a deadlocked jury.

Earlier within the retrial, his colleague Dr. Daniel Wolfe testified that harm to each O'Keefe's clothes and Learn's SUV had been inconsistent with a collision between a 2021 Lexus LX 570 and a pedestrian.

Rentschler is a biomechanist, an knowledgeable on how the forces of physics and engineering apply to the human physique.

DEFENSE ATTORNEY'S DRAMATIC COURTROOM MOVE HAS LEGAL EXPERTS TALKING IN KAREN READ MURDER TRIAL

Andrew Rentschler testifies on the accidents John O'Keefe obtained when he died on the Karen Learn retrial, Tuesday, June 10, 2025, in Dedham, Mass. (Matt Stone /The Boston Herald by way of AP, Pool)

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"A mechanical engineer, as an illustration, would possibly take a look at a bit of metal and the size and dimension of the metal. For those who apply a power in a sure route with a sure magnitude, that metal will bend, and finally it will break," he defined.

"As a biomechanist, biomechanical engineer, I do the identical factor, however I take a look at the human physique. How a lot power must be utilized, in what route, to get a selected kind of harm."

Rentschler testified {that a} 15 mph collision between a crash dummy's head and a taillight like Learn's would not have resulted in a cranium fracture. Specialists for either side have beforehand testified that his deadly harm seems in step with a backward fall – though the protection forensic pathologist Dr. Elizabeth Laposata stated in her opinion, he landed on one thing "inflexible" with a grainy texture – not the entrance garden the place he was discovered.

KAREN READ’S SILENCE IN MURDER TRIAL RAISES STAKES FOR DEFENSE

Officer John O’Keefe poses for his official headshot. O’Keefe’s girlfriend, Karen Reed, is presently on trial for homicide after he was discovered useless outdoors of a Massachusetts dwelling in January 2022. (Boston Police Division)

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Rentschler joined Laposata and one other protection witness, Dr. Marie Russell, within the opinion that scratches and cuts on O'Keefe's arm weren't attributable to an impression with the taillight. The protection concept is that they had been inflicted by a canine chew.

Learn instructed reporters Tuesday that she wouldn't be testifying in her personal protection – and that Renstchler is the final witness her staff plans to name.

"It’s the proper transfer," stated Grace Edwards, a Massachusetts trial attorney who's carefully following the case. "It's the sole resolution of the defendant whether or not to take the stand. On this case, Karen must stand up to a rigorous cross-examination by Brennan, which would come with clips from the documentary and every other proof they've that we don’t learn about from different statements she made."

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She would additionally should face questions on her consuming, Edwards stated, which might break the "upward momentum" of her protection as knowledgeable witnesses have repeatedly contradicted prosecutors' claims.