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Johnny Post

Johnny Post (played by Tim McAdams) is an African American prisoner on the HBO drama Oz. A hitman for the Homeboys, Oz's African American drug dealers, Post carries out orders against the Italian inmates on orders on Homeboy leader Jefferson Keane. He is heavily racist towards the Italians, an attitude he displays up until his death when they are murdering him.

Post is Keane's right hand man in the kitchen and all other operations in Oz. He, Keane, Simon Adebisi, and new inmate Paul Markstrom are the main Homeboys present in Emerald City. When an Italian inmate named Dino Ortolani puts Jefferson's gay brother Billie in the hospital, Keane and Ryan O'Reilly see to it that Ortolani dies at the hands of Post. O'Reilly works with the COs led by Mike Healy to transfer Post to the AIDs ward where Ortolani is currently working. When Dino gets sedated and beaten down by the COs and put into solitary, Post pays one of them off and goes in killing Dino by lighting him on fire with a match and lighter fluid. Through an investigation led by Italian staff and "family" member Lenny Burrano, Burrano and Italian leader Nino Schibetta convince Ryan O'Reilly to give up Post as a means of getting in the good graces of the Italians in the drug distribution throughout Oz. When Post is given up to Schibetta, he is tied up and the Italians give him one last chance to give up the man who ordered him to kill Dino. Instead he mouths off epithets to the Italian inmates and even states "Before I killed him, I fucked him in the ass." From there he is dismembered and Nino delivers his penis to Jefferson Keane as a warning over what will happen to the next Homeboy who crosses the Italians' path.