Prosecutors plan to wrap up their case against reputed gangster James ``Whitey'' Bulger following testimony from two final witnesses in his racketeering trial.

The government could rest its case Friday after six weeks of testimony. Bulger's lawyers are expected to begin presenting up to 16 witnesses after the prosecution rests.

On Thursday, a real estate developer recounted how Bulger shoved a shotgun in his mouth and threatened to kill him and his family if he did not pay $200,000.

The 83-year-old Bulger is charged with participating in 19 killings during the 1970s and `80s, as well as numerous extortions, while a leader of the Winter Hill Gang.

Bulger was one of the nation's most-wanted fugitives after fleeing Boston in late 1994. He was captured in Santa Monica, Calif., in 2011.