Karen Read's defense concluded with expert witness Dr. Andrew Rentschler testifying that Boston cop John O'Keefe's injuries were inconsistent with being struck by Read's SUV.

The final witness for the defense returned to the stand Wednesday in the Karen Read retrial, as Read has announced that she would not testify in the high-profile case.

Testimony resumed Friday in Karen Read’s murder retrial at Norfolk Superior Court in Massachusetts. As CrimeOnline previously reported, prosecutors alleged that Read, 45, intentionally backed her Lexus SUV into her boyfriend,

Expert witnesses clash in Karen Read's murder trial over whether her Lexus struck Officer John O'Keefe, with a retired judge noting jurors view them skeptically.

A broken taillight. A dead cop. A bombshell admission. The jury is now deliberating over whether Karen Read killed John O'Keefe.

Defense expert challenges prosecution theory in Karen Read trial, stating John O’Keefe’s head trauma pattern doesn’t match a fall on the lawn where his body was found.  Read More

The defense in Karen Read’s murder retrial rested its case on Wednesday afternoon, after Andrew Rentschler, a biomechanical engineer and accident reconstructionist from ARCCA, faced questioning all day, including a heated cross-examination. The jury was dismissed for the day at 3:38 p.m.

Near the end of the cross-examination, prosecutor Hank Brennan asked Wolfe about the holes in O'Keefe's sweatshirt by holding up a glass casing with the hoodie inside it and asked if they could have been caused by road rash.

Lawyers in the second murder trial of Karen Read are set to give their closing arguments after weeks of testimony

Prosecutors allege Read intentionally backed into O’Keefe after she dropped him off at the house party and returned hours later to find him dead. The defense has claimed that she was a victim of a vast police conspiracy and that O’Keefe was fatally beaten by another law enforcement officer at the party.