Karen Read defense attorney Alan Jackson and former Canton Police Officer Kelly Dever had a combative back-and-forth Monday.

A police officer testifying in Karen Read's retrial admitted she changed her story but also accused the defense of pressuring her to lie.

A medical doctor testified on Monday that John O’Keefe had multiple dog bites on his arm. Dr. Marie Russell took up most of the day on the stand. She was the same dog bite expert from Karen Read’s first trial.

As the trial enters its 7th week, Dr. Marie Russell, a former Malden, MA cop and University of Southern California Keck School of Medicine professor, testifies that wounds found on Boston Police Officer John O'Keefe's arm came from a dog,

Karen Read is accused of killing her Boston Police officer boyfriend. Her defense team alleges she was framed by Massachusetts state police.

Jurors in the retrial of Karen Read on Monday heard a spate of sexist messages the lead investigator of the case sent his friends, after the judge ruled to allow the since-fired Massachusetts State Police trooper’s texts into evidence.

Karen Read's defense is in full swing as a legal team led by Alan Jackson and David Yannetti looks to sow reasonable doubt in the accusation that she struck her Boston police officer boyfriend with a Lexus and left him to die in a blizzard.

On Friday, the first day of Read’s defense, the jury heard from a vehicle data expert and accident reconstructionist who examined the findings of a pair of prosecution experts. The defense will call its next witness when the trial resumes at 9 a.m. Monday.

A medical doctor testified in the Karen Read murder trial that she believes wounds to John O’Keefe’s arm were “inflicted by a dog.”