BOSTON -- A mob hit man testified Monday that information a former FBI agent provided to Boston organized crime figures led to the murders of two men in the 1980s.

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NewsCenter 5's Ron Gollobin reported that on the stand, John Martorano admitted to shooting friends, informants and others during a career in crime that began in the 1960s. He said that former FBI agent John Connolly gave information to the mob about other informants as he cultivated James "Whitey" Bulger as his own informant.

Martorano said that he went into business with Bulger in 1972 and that "Whitey Bulger told us that John Connolly wanted to meet with us."

Martorano also brought up Bulger's brother, William Bulger, then president of the Massachusetts Senate. According to Martorano, Whitey Bulger said that Connolly owed William a favor. In return, William Bulger allegedly told Connolly, "Just keep my brother out of trouble."

Connolly is accused of getting too close to the mobsters he worked with, even tipping Whitey Bulger off to his impending arrest. Whitey Bulger is still a fugitive on the loose. In return, Connolly allegedly received bribes and gifts.

Martorano said that at one point, Connolly wanted a present for his wife, so Martorano and Whitey Bulger bought a stolen 2-carat diamond ring. Martarano quoted Whitey Bulger as saying, "Any chance that we get to give him something, give it to him."

On his way out of court, Connolly said that Martorano was not a believable witness.

"These people are pure evil, and unfortunately these are the kinds of people that I had to deal with to get information," he said.

Martarano was testifying as part of a plea agreement. He is expected to be sentenced to 12 to 15 years in prison for the 20 murders he has admitted to.