CHICAGO -- The Rev. Derrick Mosley, known throughout the Chicago area as a self-proclaimed community advocate, was arrested and charged with wire fraud and extortion Monday in an alleged plot to blackmail the wife of a professional athlete.

Mosley is accused of trying to obtain $20,000 from a business manager representing the athlete's wife, claiming he had a videotape depicting her in a sexual encounter with a musician and another woman, NBC5's Darren Kramer reported. Sources confirmed the musician on the alleged sex tape was R & B star R. Kelly.

According to NBC5's sources, the tape pre-dates the woman's marriage to the unidentified athlete. R. Kelly's manager said Mosley tried to extort money from him in a separate incident. The R & B artist's manager filed for a restraining order against Mosley in 2003, NBC5's Marion Brooks reported.

Images: Reverend Accused Of Extortion, Fraud
Video: Rev. Accused Of Extortion, Fraud

Mosley appeared before U.S. Magistrate Judge Morton Denlow in a jogging suit after FBI agents arrested him at his South Side home during the predawn hours.

Federal agents say Mosley told the woman's agent he wanted the money as a counseling fee to help the wife atone for her sins. As part of the deal, Mosley allegedly promised to destroy the videotapes.

Authorities said the woman's business manager, Rufus Williams, recorded conversations with Mosley and then went to the FBI.

In a statement released late Monday, Williams said, "Derrick Mosley did not receive any money from me for his silence. Instead, he was taken into custody by the FBI."

Assistant U.S. Attorney Virginia Kendall told the judge the government would seek to detain Mosley because he was accused of committing the present crime while on supervised release in a bank fraud case.

Denlow ordered Mosley to remain in federal custody pending a detention hearing at 2:30 p.m. Thursday.

If found guilty, Mosley could face 22 years in prison, Brooks reported.