After three weeks, Hill returns to Em City and rooms with Desmond Mobay. Unbeknownst to Hill, Mobay is an undercover detective named Johnny Basil who is investigating Oz's drug trade. In the visiting room, Hill thinks he recognizes Mobay's girlfriend, forcing Mobay to put a halt to their visits. Mobay begins abusing heroin and decides he has to kill a random inmate to get in the good graces of the Homeboys. Hill initially refuses to help Mobay, but is manipulated into doing so and watches as Desmond pushes inmate Bruno Goergen down an elevator shaft. Mobay also accidentally loses his accent one night, drawing Hill's suspicion. When Hill realizes the truth and confronts Mobay, he is beaten out of his wheelchair. Mobay turns himself in for killing Goergen.