He was portrayed by Rutger Hauer who also plays Roy Batty.
He was a doctor and a priest in World War II, then became a cardinal.
When he met Kevin, he was convinced he was spoken by God and sheltered him in the Roark farm. Roark also helped Kevin in his killing sprees, eating some of the parts of his victims.
After Kevin is killed by Marv (who wanted revenge against Kevin for killing Goldie, a prostitute he fell in love with), Roark is confronted by Marv and explains the entire story to him, only to have Marv brutally kill him afterwards. It is not shown how Marv killed him, but it is implied that he severed his jugular.