authority rail yard. when it was all over, nine people were killed by the gunman. most, if not all were transit employees, including tutage singh, a husband and father of two, who lost his lives trying to warn others were coming. it took hours for michael s family and friends to realize he was never coming in. i checked in with his wife and she also had not heard from him. at that point, obviously, you start to really get concerned. reporter: just moments after the first 911 calls came in, police officers swarmed the scene from a police station and sheriff s office right across the street. they went into the building while the shots were still being fired and confronted the suspect. and the suspect then took his own life? yes. reporter: the suspected gunman, an employee of the company, seen in this security video, leaving his home