Johnny Post (played by Tim McAdams) is a fictional character on the HBO drama Oz.
Johnny Post is a member of the Homeboys, Oz's African American drug dealers. He despises the Italians, an attitude he displays up until he is murdered by them.
Post is Jefferson 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'Reily see to it that Ortolani dies. O'Reilly works with the COs led by Mike Healy to transfer Post to the AIDS ward, where Ortolani is currently working. When Dino is beaten and sedated by the guards after being put in the hole, O'Reily pays one of them off. Post is then allowed in and kills 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 O'Reily 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 Nino 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 hurls epithets at 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 Keane as a warning over what will happen to the next Homeboy who crosses the Italians.
A few episodes after his death, inmate Kenny Wangler arrives in Oz. Wangler was initially brought onto the show to fill Post's spot for the remainder of the season, but unlike Post, Wangler became a recurring character for the next four seasons.