Karen Read's lawyers are trying to prove she's the victim of a police cover-up involving the death of her Boston cop boyfriend John O'Keefe.
Read is accused of hitting O'Keefe with her SUV and leaving him to die in a snowstorm in 2022.
On Monday, a forensic pathologist testified marks found on O'Keefe's arm came from dog bites.
Read's team says O'Keefe was at a house party with several other officers and was attacked by the homeowner 's dog at one point.
Her first trial in Massachusetts ended in a mistrial due to a hung jury.
(Photo: WBZ Radio News)