BOSTON (AP) — James "Whitey" Bulger will come face to face with his former partner, Stephen "The Rifleman" Flemmi, when Flemmi takes the witness stand this week in Bulger's racketeering trial.

The two have not seen each other since Bulger fled Boston in 1994. Bulger was one of the nation's most wanted fugitives until he was captured in 2011 in Santa Monica, Calif.

Flemmi pleaded guilty to 10 murders and is serving a life sentence. He is expected to testify about Bulger's alleged involvement in numerous killings.

Bulger is accused of participating in 19 killings during the 1970s and `80s while he allegedly led the Winter Hill Gang. The 83-year-old Bulger has pleaded not guilty.

Flemmi is expected to testify mid-week.

On Monday, prosecutors plan to call a former FBI agent and a relative of one of the victims.

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