Abu-Jamal spent nearly three decades on death row before his sentence was thrown out over flawed jury instructions. He's now serving life without parole.
The Pennsylvania Supreme Court rejected his final appeal in 2012.
But Philadelphia Judge Leon Tucker ruled Thursday that a former Justice Ron Castille should have recused himself because of comments he made as a prosecutor about police killers that suggest a potential bias.
(ASSOCIATED PRESS CONTRIBUTED TO THIS REPORT)
------
Send a News Tip to Action News
Learn More About 6abc Apps