Updated

A former FBI agent who admitted revealing the identity of an informant who was then allegedly killed by James "Whitey" Bulger has given a dramatic public apology to the family of a second man who was killed along with the informant.

John Morris testified Monday at Bulger's racketeering trial that he told a fellow FBI agent that Edward "Brian" Halloran was an informant. Halloran and Michael Donahue — an innocent bystander who had offered Halloran a ride home — were then killed. Prosecutors say Bulger and another man fired the shots.

Morris' voice cracked as he told Donahue's widow and three sons, "not a day in my life has gone by that I haven't thought about this."

The 83-year-old Bulger is accused of participating in 19 killings during the 1970s and '80s.