• Supporters of Mumia Abu-Jamal, convicted in the 1981 murder of white Philadelphia police Officer Daniel Faulkner, gather outside the Criminal Justice Center in Center City Philadelphia on Monday, April 30, 2018. Former death-row inmate Abu-Jamal is in court asking a judge to vacate his previous failed appeals attempts, so he can again appeal his case. (Jessica Griffin/The Philadelphia Inquirer via AP) Photo: Jessica Griffin, AP / The Philadelphia Inquirer
Photo: Jessica Griffin, AP
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Supporters of Mumia Abu-Jamal, convicted in the 1981 murder of white Philadelphia police Officer Daniel Faulkner, gather outside the Criminal Justice Center in Center City Philadelphia on Monday, April 30, 2018. Former death-row inmate Abu-Jamal is in court asking a judge to vacate his previous failed appeals attempts, so he can again appeal his case. (Jessica Griffin/The Philadelphia Inquirer via AP) less
Supporters of Mumia Abu-Jamal, convicted in the 1981 murder of white Philadelphia police Officer Daniel Faulkner, gather outside the Criminal Justice Center in Center City Philadelphia on Monday, April 30, ... more
Photo: Jessica Griffin, AP
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FILE - In this July 12, 1995, file photo, Mumia Abu-Jamal leaves Philadelphia's City Hall after a hearing. Former death-row inmate Abu-Jamal is in court asking a judge to vacate his previous failed appeals attempts, so he can again appeal his case. less
FILE - In this July 12, 1995, file photo, Mumia Abu-Jamal leaves Philadelphia's City Hall after a hearing. Former death-row inmate Abu-Jamal is in court asking a judge to vacate his previous failed appeals ... more
Photo: Chris Gardner, AP
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Supporters of Mumia Abu-Jamal, convicted in the 1981 murder of white Philadelphia police Officer Daniel Faulkner, gather in Center City Philadelphia on Monday, April 30, 2018. Former death-row inmate Abu-Jamal is in court asking a judge to vacate his previous failed appeals attempts, so he can again appeal his case. (Jessica Griffin/The Philadelphia Inquirer via AP) less
Supporters of Mumia Abu-Jamal, convicted in the 1981 murder of white Philadelphia police Officer Daniel Faulkner, gather in Center City Philadelphia on Monday, April 30, 2018. Former death-row inmate Abu-Jamal ... more
Photo: Jessica Griffin, AP
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PHILADELPHIA (AP) — Former death-row inmate Mumia Abu-Jamal is asking a judge to vacate his failed appeals attempts so he can again appeal his case.

A judge continued the hearing Monday until August 30 after a document Abu-Jamal's defense says they need was not found.

The former Black Panther spent 29 years on death row while maintaining his innocence in the 1981 murder of white Philadelphia police Officer Daniel Faulkner. Abu-Jamal's sentence was reduced to life without parole in 2011.

Abu-Jamal's lawyers are arguing that his rights were violated during his appeals because of the bias of State Supreme Court Justice Ronald Castille, a former Philadelphia district attorney.

As prosecutor, Castille's office convinced the State Supreme Court to uphold Abu-Jamal's conviction. Abu-Jamal's attorneys say Castille should have recused from deciding the appeals.