Sorry for the vagueness, i was about 7 years old when i fist saw it. The show would always start by showing the murder, but not the murderer, then you as the viewer were treated as the head detective. At the ad break your "partner" would list the clues revealed thus far, and by the end of the episode they give the viewer a choice of suspects. One scene that stands out, a suspect in the police station runs straight at the camera when he tries to escape, knocking it over in the process, then the viewers partner picks up the camera and says, "Good job using your body to block his escape"