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.

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.