Ex-partner takes witness stand to testify against reputed gangster Bulger in Mass.

James "Whitey" Bulger and his former partner, Stephen "The Rifleman" Flemmi, are facing each other for the first time in almost 20 years as Flemmi testifies at Bulger's racketeering trial.

Flemmi took the stand to testify Thursday in Boston a few minutes before the day's court session was to end. He gave Bulger a long, hard stare as he was led into the witness box, and Bulger glanced over at him.

The 83-year-old Bulger is accused of participating in 19 killings during the 1970s and '80s. Flemmi, who's 79, pleaded guilty to 10 murders and agreed to testify against Bulger. He is serving a life sentence.

The two hadn't seen each other since 1994, when their FBI handler tipped them off that they were about to be indicted.