Yuri Bukhenik, a key investigator in the Karen Read case, is back on the stand Monday for a third day of cross-examination from defense attorney Alan Jackson as the trial enters its fourth week.You can watch testimony live on CBS News Boston by clicking on the video player above.

Testimony is continuing for another week in the murder trial of Karen Read, who is accused of backing her SUV into her Boston police officer boyfriend, John O’Keefe, and leaving him for dead. On Monday, testimony resumed with State Police Sergeant Yuri Bukhenik returning to the stand.

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.