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.

Karen Read’s case has sparked national interest, fueled by the strange circumstances surrounding the charges and a Max documentary, “A Body in the Snow: The Trial of Karen Read.”

Opening statements are expected Tuesday in the trial of Karen Read, who is accused of causing the death of her Boston police officer boyfriend but whose supporters contend is being framed for a