5. 9 Lives

Shawn and Gus visit the scene of a suspected suicide, one of several in a short span of time. He finds signs point to murder, and uses the victim's cat to help keep the case open. Another suicide is reported shortly afterwards, strengthening Shawn's theory. Finding no clues, Shawn and Gus revisit the beginning of the string of "suicides", and talk with the brother of the original victim. They discover that every victim called the same stress line before they died. They open up a fake business in the same building as the stress line, in order to gather more information. Shawn realizes that a repairman has been working on phone lines outside the stress line for several weeks. He discovers Officer McNab recently called the line, and breaks into McNab's apartment just before the killer can strike again.