FBI Informant Accused of Murder

Part 2: Mani Chulpayev accused in the killing of Atlanta rapper Lil Phat.
5:31 | 07/17/13

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Transcript for FBI Informant Accused of Murder
As we road around ft. Lauderdale in a black maserati, the man behind the wheel, mani chulpayev was doing all he could to persuade me that he was no longer a russian mobster protected by the fbi. Back at his luxury car business he denied he was dealing in stolen cars or doing anything illegal. Can you sit here and say you're not involved in any on going criminal activity? Most definitely. Nothing whatsoever? Most definitely. Only a few weeks later armed police raided his operation and took him into custody. He is now indicted by a grand jury in georgia along with four other men on charges of murder, felony murder and street gang activity. Possession of a firearm by a convicted felon. The murdered man was melvin vernell, a popular atlanta rapper using the name lil phat. He was murdered last year outside the hospital where his fiance was about to give birth. He was shot multiple times next to his car. Reporter: Authorities content at the same time chulpayev was serving an an informant for the fbi he helped arrange the murder of the rapper by tracking the victim's vehicle with a gps device. This defendant actually tracked the vehicle over 11 occasions and provided that tracking information to the other two defendants who ultimately killed and shot the victim there at the hospital. Reporter: IN COURT IN Atlanta, chulpayev's lawyer, george plumides, said his client was not involved and that he had kept his fbi agent and handler fully informed. Everything goes through the handler. He delivered mani to the fbi headquarters and debriefed him and told him everything that he knew about the tracking devices. Reporter: Then the prosecutor said, in fact, chulpayev had essentially conned the fbi by lying about his involvement to his handler. He went into the fbi on july 30th of 2012, six weeks after our victim was murdered and he lied to the fbi, lied to federal agents. He did not cooperate with the state. The evidence will show that he has done nothing but lie about his involvement in this murder. It's simply not true that he is a cooperating witness with the fbi or the state when it comes to this matter. Reporter: Adding to the intrigue according to georgia authorities and the lawyer is the role of the fbi agent who was chulpayev's handler. He says the agent asked for lavish gifts and cash from chulpayev and then tried to block detectives. The fbi agent was obstructing the investigation of a murder? That's my opinion and mani's. Reporter: The fbi agent asked for tickets to see the miami heat play and also asked, says the lawyer, for expensive watches, the use of luxury cars, vip entrance to night clubs and $3500 in cash. He gave him cash? Yes. Hotel rooms? Yes. Jewelry, watches? Yes. And cars? Yes. For the use of the fbi agent? Yes. It was under the assurance that they were for lawful, law enforcement practices. Reporter: Fbi officials say they are taking the allegations seriously. The fbi's own inspection division are both investigating according to what officials told abc news in this statement. Be assured that the fbi holds everyone of our 36,000 employees to the highest standards. When an allegations of this conduct arises, it is taken seriously and addressed, the statement reads. It would hardly be the first time an fbi agent and an informant have been accused of crossing lines. Most prominently boston mob boss whitey bulger accused of giving gifts to agents for years as they looked the other way. That's part of the criminal justice system. There are thousands of people in the witness protection program who were serious criminals and now they have new identities and jobs a many turn their lives around. The bad part is on occasion it doesn't work. I knew that mani chulpayev would be on the street after the cases were over. He was a player. He was a street guy. It's hard to take someone like that and say, okay, you've signed the cooperation agreement. Now go out there and work in an office filing paper. It's just not in his blood. Reporter: Mani chulpayev says being an fbi informant had nothing to do with his life of luxury and fast cars, that he would have been better off serving his time in prison. I don't think I got a better end of the deal, you know. Being if the situation were reversed I would have took my chances, got convicted and served my time and not lived this life that I am now. Why do you call it that now? energy cycle...

This transcript has been automatically generated and may not be 100% accurate.

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