Blood on the Tracks

S1, E7: Detectives Tim Entenok and Joselito Sandoval are called to a crime scene at Brookside Park at 11:00 am, where a missing person is found dead in a 4-foot-diameter sewage drain, in a remote section of the park. The body is found 300 feet deep in the pipe, which has been draining a constant flow of rainwater. When Entenok takes a closer look at the body, he notices that it is maggot-infested: an indication that the body has been in the pipe for over a week. The victim's head, surrounded by a dried pool of blood, seems to have bullet holes, but the maggots preclude an accurate visual assessment. Only an autopsy will determine the cause of death. Meanwhile Sandoval scours the nearby train tracks for additional evidence. A few rocks, stained with a blood-like substance, are collected. The investigation seems to go cold with no leads until a female witness gives them a much-needed break in the case.