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.

At least nine key witnesses remain for both the prosecution and the defense at Karen Read's second trial. Here's who they are.

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

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.

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.

The case out of Dedham, Massachusetts, has turned into a yearslong whodunnit legal saga that has captivated true-crime fans across the country.

A Massachusetts State Police sergeant returned to the stand Monday to testify in the Karen Read murder retrial.Sgt. Yuriy Bukhenik is<a class="excerpt-read-more" href=" More

The conduct of a former Massachusetts state trooper who was fired over his handling of the Karen Read murder investigation took centerstage at her retrial this week as defense lawyers spent hours grilling the ex-officer’s supervisor.