S12, E11: Father Grady, a priest at the Don Bosco Church, is found murdered in the confessional booth. The Detectives have few leads but start by investigating some of the more difficult boys who attend the adjacent parochial school. One suspect is Tim Boswell, a wild student who was suspended. When they go to his apartment to question him, his mother has clearly been beaten up. She says she tripped on the stairs. The Detectives find Tim with some neighborhood hoodlums and bust him on a drug charge. He eventually admits to being at the school the day of the murder, but claims he was only there to pick up drugs from his locker. He also says that Father Grady had instigated a relationship with his mother, which infuriated his father.