O’Keefe’s niece was just 14 years old when her uncle “JJ” died. She took the stand in Karen Read's murder retrial Wednesday.

John O'Keefe's niece was the first witness to take the stand at Karen Read's trial Wednesday morning.The niece, who WBZ-TV will not identify by name, is now a high school junior. She was around 14 years old when John O'Keefe died.

The medical examiner who performed Boston police officer John O’Keefe’s autopsy took the witness stand Thursday in the Karen Read murder<a class="excerpt-read-more" href=" More

Massachusetts State Police sergeant's testimony in Karen Read's murder trial reveals doubts about John O'Keefe's injuries, questioning hit-and-run charges.

(WJAR) — Testimony continues on Thursday in the Karen Read murder trial. The Bristol County woman is accused of killing her Boston police officer boyfriend John O’Keefe. On Wednesday the niece of O’Keefe testified. O'Keefe took care of his niece and nephew after their parents died.

Prosecutors played multiple profanity-laden voicemails that Karen Read left John O’Keefe on the morning he died for jurors in Read's murder trial.

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.

John O'Keefe, the victim in the Karen Read case, was a Boston police officer and Braintree native who Read was dating at the time.

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