Mark Mack is a fictional character in the HBO series Oz, portrayed by Leif Riddell.
Prisoner #96M542. Convicted June 1, 1996 - Murder in the second degree, vandalism (as a hate crime). Sentence: 70 years, eligible for parole in 40.
Mack is a member of the Aryan Brotherhood. Imprisoned for vandalizing a Jewish tombstone with a swastika and murdering a black man working in the cemetery, he is an enforcer for the Brotherhood who follows orders of leader Vernon Schillinger without question. Mack is hard-headed and bullies various inmates around. This eventually gets him killed as he is escaping, when he bullies some inmates to let him use an escape tunnel they were building.
Mack, with the help of Aryan CO Karl Metzger, forces the old men to trade cells so he can escape instead. The old men agree, but before they leave, Rebadow encourages Busmalis to weaken the beams throughout the tunnel, ultimately resulting in the collapse of the tunnel and the death of Mark Mack and his unnamed Aryan ally. When the tunnel collapses, the prisoners within this unit are dragged from their beds to stand in line while the bodies are removed. Busmalis and Rebadow are brought before McManus, who sees no reason to discipline the two old men after hearing Rebadow explain that Busmalis never dug the tunnel out of free will, but was forced to by Mark Mack.