Expect insanity defense in LA killings LOS ANGELES, Jan. 19 (UPI) -- A California prosecutor said he expects an insanity defense or post traumatic stress claim from an Iraq war veteran accused of killing four homeless men. District Attorney Tony Rackauckas of Orange County said if the attorney for Itzcoatl Ocampo attempts such a defense it's "not going to fly," the Los Angeles Times reported. Ocampo, 23, didn't enter a plea when he appeared Wednesday for a brief court hearing. His attorney, Randall Longwith, told the judge he didn't know what kind of a defense to mount because he spent no more than "15 seconds" with his client. Ocampo is accused of hunting down and brutally stabbing four homeless men in suburban Los Angeles over a period of several weeks this month. He was arrested last Friday following the stabbing death of a homeless man behind a fast-food restaurant in Anaheim, Calif. Friends and family have described Ocampo as someone who had a longstanding empathy for the poor and homeless but returned from Iraq in 2010 as a changed man.