A former hitman who admits killing 20 people is expected to take the stand at the trial of reputed gangster James "Whitey" Bulger in Massachusetts.
John Martorano served a little over 12 years in prison after striking a cooperation deal with prosecutors. He was released in 2007.
The 83-year-old Bulger is charged in a 32-count racketeering indictment that accuses him of participating in 19 murders in the 1970s and '80s. He is also charged with extorting bookmakers, drug dealers and others running illegal businesses.
Martorano is one of three former Bulger loyalists who struck deals with prosecutors and agreed to testify against him. Bulger's former partner, Stephen "The Rifleman" Flemmi, and former Bulger lieutenant Kevin Weeks are also expected to be key prosecution witnesses.
Martorano is expected to testify today.
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