Witness Jen McCabe testified in the Karen Read trial regarding the night Boston police officer John O'Keefe was found dead, with defense claims of a conspiracy against Read, who pleaded not guilty to his murder.

Cellebrite expert Ian Whiffin walked jurors through one of the most contentious pieces of evidence in Karen Read’s case Monday.

Key witness Jen McCabe took the stand Tuesday in the sixth day of witness testimony in the Karen Read trial after a cellphone expert finished his testimony about McCabe's disputed Google search and John O'Keefe's movements the night of his death. When court was done for the day, Judge Beverly Cannone issued a stern warning for defense attorneys.