Mosley reportedly claimed he had a videotape of Sheffield's wife having sex with another man.
Authorities say Mosley called Sheffield's business manager and demanded money in exchange for the tape.
In an exclusive interview today, Mosley told his side of the story to ABC 7's Ben Bradley.
Derrick Mosley has gone from being a convicted felon to working as a community activist. Now he is back behind bars speaking for the first time about the alleged shakedown of a professional baseball player.
"My motives were altruistic. There was never any malicious intent," Mosley said.
Derrick Mosley says he was looking to do some good. He wanted to "help" not "hurt" New York Yankees outfielder Gary Sheffield and his wife, DeLeon. Mosley says he came across videotape that showed DeLeon having sex with Chicago R and B singer R. Kelly. It's a tape that was supposedly shot more than 10 years ago.
BEN: "So you were trying to help Gary Sheffield's wife?"
DERRICK MOSLEY: "Without getting too specific, my motives were to actually be of help, never to hurt. Never to get anybody to think they were being blackmailed or anything along those lines."
Derrick Mosley admits to taking the videotape to Sheffield's agent, Rufus Williams, earlier this month. Williams went to the feds after he says Derrick Mosley demanded $20-thousand dollars to destroy the tapes and be hired to "minister" to Sheffield's wife.
"He proclaims himself a reverend and suggested she needs atonement for the crimes she committed, the moral crimes," Rufus Williams said.
"This whole thing as it relates to extortion, it's totally taken out of context. Even when money was mentioned in a couple of conversations, it was never a threat posed to him," Derrick Mosley said.
Mosley claims to have turned his life around after a 1999 conviction for bank fraud. But nearly two years ago attorneys for R. Kelly asked for and received a restraining order against Mosley. They claim "he demanded he be paid $50,000 for no apparent purpose." A letter from Mosley indicates he had hoped to be hired to put a positive spin on R. Kelly's legal troubles.
BEN: "Can't people call into question your motivations when you're asking for money to speak in favor or something, as an activist?"
MOSLEY: "No, I don't think that's what I was asking to do. I was asking to speak on this person's behalf... I think it's a difference."
In press releases, and in statements, over the last several years Derrick Mosley has referred to himself as "reverend." Now he confirms that he never received any formal religious training and is "not" a pastor.
Nonetheless, Mosley says he has "ministered to many" over the years and believes his is a helping voice in the community.
Jailhouse interview Part 2
This is part 2 of an exclusive jailhouse interview with the man at the center of an alleged extortion plot --involving one of baseball's biggest stars and his wife.
"Even when money was mentioned to him it was never a threat to him," said Derrick Mosley.
Derrick Mosley is a Chicago activist who is accused of trying to blackmail New York Yankees slugger Gary Sheffield and his wife.
ABC 7's Ben Bradley spoke with Mosley in an exclusive interview at the Metropolitan Correctional Center.
Derrick Mosley says for the last several years his mission has been to help those in need.
He claims that's exactly what he was doing when the feds busted him for blackmail.
"At no point did I ever say, 'If you give me this, I will not do this.' As far as anything that could damage them, that never ever happened," Mosley said.
Derrick Mosley calls the sex tape he says he saw "repulsive." The feds say he also saw an opportunity.
The players in the story are all high profile. Mosley claims the sex tape features Chicago R&B star R. Kelly having sex with the now wife of Yankee's outfielder Gary Sheffield and another woman.
"It was dealing with a moral issue as well as an issue that could be quite damaging. With that, I sincerely came forward -- and the evidence will show -- it's more of me trying to help than anything that could be misconstrued as extortion or blackmail. Never," Mosley said.
The feds claim to have Mosley on tape demanding the baseball player's agent "hire" him to "minister" to Sheffield's wife.
Court documents claim Mosley said "...$20,000 ain't nothing compared to what he could have gained if he was sleazy."
"He proclaims himself a reverend and suggested she needs atonement for the crimes she committed, the moral crimes," said Rufus Williams, Gary Sheffield's agent.
"As a matter of fact I am so aware of what blackmail and extortion is, I would always be mindful of that. I would have never come forward and tried to pull that on anybody," Mosley said.
Mosley is familiar with the law because this isn't the first-time he's been behind bars. Back in 1999 he was convicted of bank fraud. In 2000, he returned to Chicago and began to gain steam as a community activist.
He would show-up a crime scenes, he spoke-out against the owners of the E-2 nightclub. Mosley was never shy about seeking the media spotlight.
On press releases he advertised himself as a "reverend" even though he is "not."
"I never get caught-up in titles. All I know is Derrick Mosley is someone who has come from turbulance and made great strides to turn his life around. My track record once again speaks for itself," Mosley said.
The ballplayer's wife who was supposedly videotaped 10 years ago is from Chicago. Her mom now lives in the suburbs. She says her daughter has "found God" since that tape was made.
Derrick Mosley appeared in court on Thursday afternoon where judge upheld the charges against him. He will be back in court in the next several days for a bond hearing. In the meantime he remains in federal custody.
HELP MY AZZ.....He was trying to HELP HIMSELF TO SOME MONEY!!!
So, who is the other person? 
The NERVE!!! BS from a "False Prophet"
Linear Mode
