According to Lieutenant Billy Grammer, a dispatcher for the Dallas Police Department, he received an anonymous phone call at 3 a.m. on November 24 from a man who knew Grammer's name. The caller told Grammer that he knew of the plan to move Oswald from the basement and that unless the plans for Oswald's transfer were changed, the caller warned "we are going to kill him". After Oswald was shot, Grammer, who knew Ruby, and found the voice familiar at the time of the call, identified Ruby as the caller. Grammer remained convinced that Ruby's shooting of Oswald was "a planned event".