Biomechanical engineer testifies injuries inconsistent with taillight impact in Karen Read murder case, after judge interrupts his birthday message.

Jurors in Karen Read’s retrial will hear from the defense’s final witness on Wednesday as deliberations in the high-profile murder case draw near.Read, 45, of Mansfield, is accused of striking John O’Keefe,

Judge Beverly Cannone also denied the defense team’s motion for a mistrial based on what Read’s lawyers called “intentional misconduct” from prosecutor Hank Brennan.

Read flashed the sinister smirk as graphic images of John O’Keefe’s bruised and mangled body were revealed to the jury.

For the second time in a week, Judge Beverly Cannone denied Karen Read's attorneys' request for a mistrial after they accused the prosecution of misconduct.

Karen Read's defense presents expert testimony that Officer O'Keefe's fatal injuries resulted from falling backward, with facial wounds caused by a separate impact.

Week 6 of the Karen Read trial centered on accident reconstruction, data from Read’s Lexus, and expert testimony suggesting her SUV could’ve caused John O’Keefe’s injuries—but didn’t prove it.