"I was happy for Karen Read and her family of course. I think justice was served," Prado said. "But seeing John O'Keefe's family leaving the courthouse, was melt my heart. I'm a mother and I saw her pain through all those days."

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.

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.