HBO MAXSERIESMOVIESNEW & LAST CHANCESCHEDULEFREE EPISODESMoreDocumentariesSpecialsSportsPodcastsSIGN INGET HBOMAXHBO MAXSERIESMOVIESNEW & LAST CHANCESCHEDULEFREE EPISODESMoreDocumentariesSpecialsSportsPodcastsSIGN INGET HBOMAXSIGN INStream all of HBO plus more TV, movies, and Max Originals at no additional cost.SIGN INHBO Max Oz About Season Season 1Season 2Season 3Season 4Season 5Season 6Cyril O'Reily Played by Scott Winters Ryan O’Reily’s dim-witted brother, Cyril arrives at Oz after murdering Dr. Nathan's husband. He's put into Gen Pop and given Vern Schillinger as a cellmate.