His testimony put former Gambino boss John "Dapper Don" Gotti behind bars for the rest of his life, but Sammy "Bull" Gravano could emerge as the star witness in the defense of John "Junior" Gotti.
The former mob turncoat testified for the feds against Gotti in 1991 -- finally sinking the Teflon Don, who was sentenced to life behind bars where he died in 2002.
In an ironic twist, Junior's defense team, led by lawyer Charles Carnesi, said today that it is looking to use Gravano to the younger Gotti's advantage.
Carnesi said he plans to interview Gravano about the murder of soldier Louis DiBono -- a gangland slaying the feds claim Junior was involved in -- and how he has testified at past trial about it without ever mentioning the younger Gotti's involvement. "I'll interview him and I'll see what we do," said Carnesi.
The move was revealed by the judge during the course of Gotti's trial.
Gravano, who testified during the John Gotti trial that he was involved in 19 murders, is currently in Arizona state prison after opting out of the federal Witness Protection Program in 1995. Since 2002, Gravano, now 64, has been serving a 19-year sentence for his role in a drug-trafficking ring.
Gravano has testified in the past that his last murder was the whacking of DiBono in October 1990.
The feds claim Junior helped put together the hit while working as a captain for the Gambinos.
Gotti is on trial for a fourth time in Manhattan federal court on racketeering charges and for his involvement in five murders. The other three ended in either a mistrial or hung jury
