Cyril O'Reily is a fictional character, played by American actor Scott William Winters, on the HBO drama Oz. He is also mentioned in the companion book Oz: Behind These Walls: The Journal of Augustus Hill. Character overview "Prisoner #98P284. Convicted July 1, 1998 - Murder in the first degree. Sentence: Life imprisonment, up for parole in 60 years. Convicted in 2002 of murder in the first degree and sentenced to death." Cyril was a hoodlum like his brother Ryan (who is actually his half-brother, as was revealed by Suzanne Fitzgerald). Cyril was Ryan's lieutenant and bodyguard in the Bridge Street Gang until he was injured in a fight, suffering brain damage. In the second season of Oz, Cyril murders the husband of Dr. Gloria Nathan on orders from his brother, who is in love with Dr. Nathan. Arriving in prison, Cyril is originally housed with Vernon Schillinger, head of the Aryan Brotherhood. After Schillinger rapes Cyril, however, Ryan gets his brother transferred to his own cell. In the last season of the show, Cyril is executed despite Ryan's multiple attempts to save his brother, and despite Cyril's intellectual disability. Although Cyril is normally placid, he is prone to violent attacks on people when enraged, often showing great strength, which has earned him the resentment, but also the respect, of many inmates. Fictional history Season 2 Cyril O'Reily is the mentally handicapped brother of Ryan O'Reily, an Irish American sociopath serving time in Oz. He first appears when Ryan has surgery for breast cancer. Cyril is upset because their mother had died of cancer. After recovering, Ryan falls in love with Dr. Gloria Nathan, the prison doctor who helped save his life. Ryan feels that the only thing preventing a potential relationship with her is her husband, Preston, so he asks Cyril to murder him. Cyril does as he's told, and is sentenced to life in prison. Although Cyril is mentally disabled, he knows enough not to implicate Ryan in the crime as he worships his brother. Dr. Nathan and Unit Manager Tim McManus know that Ryan is responsible and demand that he confess, but Ryan says nothing and Cyril arrives in Oz. When Cyril arrives in Oz he is put in Unit B, where he is approached by Aryan leader Vernon Schillinger, who promises to take Cyril to see Ryan. Schillinger instead takes him to a storage closet where he