In 1988, the FBI assigned Mulder to the Violent Crimes Unit. Around this time, Mulder first came across the X-Files, an obscure FBI section dealing with cases relating to the paranormal; he pored over these cases in his spare time, becoming obsessed with them. In 1991, Mulder re-opened the X-Files with Special agent Diana Fowley, but Fowley left shortly thereafter. Mulder investigated the X-Files by himself until March 1992, when Dana Scully, an instructor at the FBI Academy's Forensic Science Research and Training Center, was partnered with him for the purpose of applying scientific reasoning to Mulder's work and theories.