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

Maureen Hartnett, a state crime lab analyst, testified that she found a hair and pieces of glass on Read's SUV.

The second murder trial of Karen Read, a former adjunct professor and financial analyst who is accused of causing the death of her Boston police officer boyfriend, continues Monday with additional witnesses to be called to the stand.

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

Day 15 of witness testimony is expected to resume on Wednesday after testimony was cancelled on Tuesday due to ’unavoidable circumstances‘.

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 ongoing trial is Read’s second; her first murder trial ended in a high-profile mistrial last July after jurors returned deadlocked. Abby Patkin is a general assignment news reporter whose work touches on public transit, crime, health, and everything in between. She has been covering the Karen Read murder case.

Witness testimony in the second trial of Karen Read will not occur on May 13 as expected, a court spokesperson said.