Karen Read pleaded not guilty to murder charges in the death of Boston police officer John O’Keefe and is facing a retrial after a jury was unable to reach a verdict last year.

Canton Fire Department paramedic Timothy Nuttall shows how to do a Carotid Pulse at Karen Read's second murder trial at Norfolk Superior Court on Tuesday, April 22, 2025 in Dedham, Mass. Photo by Stuart Cahill/The Boston Herald via AP, Pool

A crime lab analyst with Massachusetts State Police will return to the witness stand after testifying on Wednesday. Maureen Hartnett will continue testimony on her examination of evidence, including read’s SUV and O’Keefe’s clothing.

Karen Read pleaded not guilty to murder charges in the death of Boston police officer John O’Keefe and is facing a retrial after a jury was unable to reach a verdict last year.

The protesters fighting the court’s buffer zone in the high-profile Karen Read case have scored a win in federal appeals court. The buffer zone around Norfolk Superior Court in Dedham was expanded for the Read retrial after jurors during the first trial reported that they could hear loud protesters during deliberations.

Footage shows 'Turtleboy' blogger Aidan Kearney yelling and gesturing at a surveillance camera in a pizza shop owned by Karen Read trial witnesses.

Defense in Karen Read trial proposes that Boston Police Officer John O'Keefe's death might be linked to a "jealousy"-fueled fight with ATF agent Brian Higgins.