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.

Karen Read’s second murder trial was a rematch for the lawyers after the first ended in a hung jury last year. CNN correspondent Jean Casarez answers key questions about the case after Read was acquitted of murder Wednesday.

Prosecutors alleged Read hit her boyfriend, John O'Keefe, with her car outside another officer's home in January 2022 and then left him to die there during a blizzard.