The Campus Killer - S9.E6

The body of Katherine Foster is discovered at the University of Alabama. A student reports hearing gunshots the night before she was found, leading police to conclude that Foster was shot and left in the woods. Suspicion falls on a campus security guard, an apparent suicide who was obsessed with Foster's murder. The guard is cleared and the case goes cold for two decades before a whispered confession to an AA sponsor leads police to arrest and convict Jamie Letson, a friend of Katherine's.