Meek Mill. Photo: Shutterstock.com

Imprisoned hip-hop star Meek Mill has opened a new avenue of appeal, focusing on recent revelations that a key witness in his case is one of several police officers that the Philadelphia District Attorney's Office has reportedly deemed to have questionable credibility.

Mill, whose legal name is Robert Williams, filed a petition under the Post-Conviction Relief Act, contending that recent reports raising credibility concerns about Philadelphia Police Officer Reginald Graham warrant the withdrawal of the drug- and gun-related charges he was convicted for in 2008.

“His conviction resulted from the unavailability at the time of trial of exculpatory evidence that has subsequently become available and would have changed the outcome of the trial if it had been introduced,” the petition, filed by Brian McMonagle of McMonagle, Perri, McHugh & Mischak and Ardmore attorney Peter Goldberger, said.