A man police consider a person of interest in the fatal shooting of Denver Broncos cornerback Darrent Williams was transferred to federal custody Thursday after completion of his state sentence on a parole violation. Willie Clark, 25, was sentenced in February to 180 days in prison after authorities said Clark had been living in a different house than the one listed in his parole agreement. Colorado Department of Corrections spokeswoman Kathrine Sanguinetti said records indicated he was released Thursday on parole, but later learned he had been transferred to federal custody. Jeff Dorschner, spokesman for the U.S. Attorney's Office, said he could not comment. Denver police spokesman John White said the arrest was unrelated to the homicide investigation. Clark has been in custody since Jan. 5, days after Williams, 24, was shot in the neck and two other people were wounded as they were riding away from a New Year's Eve party at a Denver nightclub in a stretch Hummer limousine.