Read’s defense attorneys argued that O’Keefe, who allegedly had a long-standing disagreement with someone at the party, was severely injured during an argument at the party and may have been attacked by a dog given the deep wounds on his arm.

Boston Police Officer John O'Keefe, his girlfriend Karen Read and a group of other friends, including fellow officers, went out drinking at C.F. McCarthy's bar in Canton, Massachusetts at around 9 p.m. A major snowstorm had begun.