On April 30, 2018, the Pennsylvania Supreme Court ruled that Abu-Jamal would not be immediately granted another appeal and that the proceedings had to continue until August 30 of that year. The defense argued that former Pennsylvania Supreme Court Chief justice Ronald D. Castille should have recused himself from the 2012 appeals decision after his involvement as Philadelphia District Attorney (DA) in the 1989 appeal. Both sides of the 2018 proceedings repeatedly cited a 1990 letter sent by Castille to then-Governor Bob Casey, urging Casey to sign the execution warrants of those convicted of murdering police. This letter, demanding Casey send "a clear and dramatic message to all cop killers," was claimed one of many reasons to suspect Castille's bias in the case. Philadelphia's current DA Larry Krasner stated he could not find any document supporting the defense's claim. On August 30, 2018, the proceedings to determine another appeal were once again extended and a ruling on the matter was delayed for at least 60 more days.