A friend of John O'Keefe, Jennifer McCabe met him and Karen Read out at the Waterfall bar the night before he died.

The Karen Read trial is back in court Tuesday for a sixth day of witness testimony. Key witness Jen McCabe is now on the stand after a cellphone expert finished his testimony about her disputed Google search and John O'Keefe's movements the night of his death.

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 trial is entering its second week as the prosecution continues to call key witnesses.