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.

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

Jen McCabe testified how she met up with Read and O'Keefe at a bar that night and later saw Read's SUV outside 34 Fairview in Canton, where O'Keefe was later found dead.