The Karen Read trial is back in court Tuesday for a sixth day of witness testimony with a cellphone expert back on the stand for cross-examination expected about Jen McCabe's Google search and John O'Keefe's movements the night of his death.

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

Mark Bederow, criminal defense attorney and former prosecutor, joins NewsNation to analyze the sixth day of testimony in the Karen Read murder retrial. Defense attorneys pointed to victim John O'Keefe's iPhone movement and Face ID unlock,