Dever, who worked in Canton at the time of Read’s arrest, was called by the defense Monday morning. On the stand, she faced aggressive questioning from Alan Jackson, one of Read’s lawyers, about a statement she made to federal investigators looking into the death of Read’s boyfriend, John O’Keefe.

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.