A couple walks past a video billboard showing an FBI notice about mob boss James 'Whitey' Bulger on display in New York's Times Square, June 23, 2011. After an international manhunt, the FBI caught Bulger at an apartment in Santa Monica, Calif., along with longtime girlfriend Catherine Greig. Bulger's trial began June 12, 2013, in federal court in Boston. Mary AltafferAP
In this photo taken June 6, 2013, Stephen Rakes smiles after greeting an acquaintance outside the liquor store he once owned in the Boston neighborhood known as 'Southie' (for South Boston). Mr. Rakes, who had been a possible witness in the ongoing federal racketeering trial of reputed mobster James 'Whitey' Bulger, was found dead 11 days later in Lincoln, Mass. Michael Dwyer/AP/File
This booking photograph shows Boston mob boss James 'Whitey' Bulger. Bulger, a notorious Boston gangster on the FBI's 'Ten Most Wanted' list for his alleged role in 19 murders, was captured in June 2011 in Santa Monica, Calif. WBUR 90.9/AP
A courtroom sketch depicts James 'Whitey' Bulger (c.) during a pretrial conference before US District Judge Denise Casper (l.) in a federal courtroom in Boston, June 3, 2013. Bulger is flanked by his attorneys, Henry Brennan (l.) and J.W. Carney Jr. (r.). Jane Flavell Collins/AP
J.W. Carney, defense attorney for accused mob boss James 'Whitey' Bulger, arrives at the US Federal Courthouse for the start of Bulger's trial in Boston on June 12, 2013. Bulger is accused of committing or ordering 19 murders while running Boston's Winter Hill Gang in the 1970s and '80s. Brian Snyder/Reuters
A poster featuring fugitives James 'Whitey' Bulger and Catherine Greig is seen at the FBI field office in Boston. FBI agents on the trail of Bulger turned to TV ads aimed at women to help them bring the fugitive Boston mob boss to justice. Michael Dwyer/AP/File
FBI agents carry evidence bags as they walk out of an apartment complex where fugitive James 'Whitey' Bulger and his longtime companion, Catherine Greig, were arrested in Santa Monica, Calif., in June 2011. The alleged Boston mob boss was captured after 16 years on the run, in a case that embarrassed the FBI and exposed the bureau's corrupt relationship with underworld informants. Jae C. Hong/AP
Police and the FBI surround the apartment building in Santa Monica, Calif., where James 'Whitey' Bulger and Catherine Greig were arrested without incident. David Zentz/AP/File
This image from video shows Bulger and his longtime girlfriend, Catherine Greig. FBI/AP/File
Former FBI agent John Connolly, seen here in 1998, was accused of protecting two alleged mob bosses, Stephen 'The Rifleman' Flemmi and James 'Whitey' Bulger. Connolly was indicted Oct. 11, 2000, on charges that he tipped off Flemmi and Bulger to witnesses and informants who then were killed by the mob. George Rizer/The Boston Globe/AP
Kevin Weeks, a former top lieutenant to Bulger, during an interview with the Associated Press in Boston in June 2011. Weeks is on the witness list to testify at Bulger's trial. Stephan Savoia/AP
In 2008, jailed Boston mob leader Stephen 'The Rifleman' Flemmi testifies in a Miami courtroom in the second-degree murder trial of former FBI agent John Connolly. Flemmi is on the witness list to testify at Bulger's trial. J. Pat Carter/AP
Reputed Boston mobster and fugitive James 'Whitey' Bulger in December 1998. Bulger, a notorious Boston gangster on the FBI's Ten Most Wanted list for his alleged role in 19 murders, was captured near Los Angeles in 2011 after living on the run for 16 years. FBI/AP
Jack Nicholson (r.) plays Francis 'Frank' Costello in 'The Departed,' a Martin Scorcese film about Boston gangsters, along with Leonardo DiCaprio as William 'Billy' Costigan Jr. The character of Frank Costello was loosely based on 'Whitey' Bulger. Andrew Cooper/Warner Bros. Pictures
Tommy Donahue (l.), son of murder victim Michael Donahue, speaks to media as Steve Davis, brother of murder victim Debra Davis, listens outside federal court in Boston, June 3, 2013, after a pretrial hearing for alleged mobster James 'Whitey' Bulger. Elise Amendola/AP
The graphic testimony by Stephen 'the Rifleman' Flemmi, Whitey Bulger's former partner in the Winter Hill Gang, may be the most important for prosecutors trying to build an iron-clad case.
In matter-of-fact tones that made him appear completely unmoved at recalling the many violent deaths he admits causing or helping plan, Stephen “the Rifleman” Flemmi on Friday detailed murder after grisly murder committed alongside defendant James “Whitey” Bulger.
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