ARCCA tested a direct impact at 29 mph and found the exemplar SUV’s back window shattered and the vehicle sustained more severe damage to its rear than Read’s had.

Special prosecutor Hank Brennan drills ARCCA crash analyst Daniel Wolfe during the murder retrial of Karen Read in Norfolk Superior Court. – Pat Greenhouse/Boston Globe Staff With jurors gone ...

ARCCA performed a series of tests using an exemplar Lexus and a test arm positioned how the prosecution’s accident reconstruction expert, Judson Welcher, concluded O’Keefe’s arm was oriented.

He said ARCCA could only turn over the final report that he testified to in the first trial and that all the “raw data” was classified by the federal government.

Two expert witnesses for murder defendant Karen Read said that while victim John O’Keefe experienced major head trauma, the absence of other significant body injury made it unlikely a ...

ARCCA was hired as part of the now-closed federal investigation into how police handled Read's case. Rentschler began by going over his credentials and what ARCCA does.

Karen Read retrial jurors could enter deliberations possibly this week as the defense’s case has already doubled its length from last year.

He said ARCCA was asked to determine if the damage to Read’s SUV was consistent with O’Keefe’s injuries. Wolfe and two other experts reviewed numerous materials including an autopsy report, ...

Defense witness Andrew Rentschler of ARCCA on the stand during the Karen Read retrial in Norfolk Superior Court, Wednesday, June 11, 2025, in Dedham, Mass. (Greg Derr/The Patriot Ledger via AP, Pool) ...

Cannone did not rule on whether ARCCA can testify as to any new conclusions. What exactly prompted the government to retain ARCCA for a federal investigation into O’Keefe’s death remains unclear.

DEDHAM, MASS. (WHDH) - The judge in the Karen Read murder retrial once again rejected the defense’s request for a mistrial Monday. Read and her defense team arrived at Norfolk District Court in ...

ARCCA used a Lexus SUV that is the same year, make and model of the one Read was driving on the night of O’Keefe’s arm and performed “full-scale vehicle testing.” ...