evidence: Disgraced R&B singer and convicted sex trafficker R. Kelly has been transferred to a federal prison in North Carolina. R. Kelly, whose full name is Robert Sylvester Kelly, was moved to FCI Butner Medium I, a "medium security federal correctional institution," according to the Federal Bureau of Prisons website. [...] R. Kelly was previously being held in Chicago, where he was sentenced in February to 20 years in federal prison after being convicted on three counts of production of child pornography and three counts of enticement of a minor to engage in criminal sexual activity.