3: Shawn O'Brien | Mysterious Death

In the summer of 2006, a father is found dead in his apartment. His cause of death is blunt force trauma. Did he have a seizure and receive his head injury from a terrible fall? Or did he receive this fatal injury at the hands of another? 

The Investigators dig deep into Shawn O'Brien's case as they examine his life, the scene, evidence and case files from more than a decade ago.