Testimony has concluded in the first phase of Yosemite killer Cary Stayner´s triple-murder trial in San Jose, California. Defense lawyers and prosecutors presented 55 witnesses over five weeks of evidence. Defense lawyers presented a final witness in the battle over whether Stayner´s brain is abnormal. It concluded many days of testimony from psychologists and psychiatrists who performed a battery of tests on the confessed killer. Stayner has pleaded innocent by reason of insanity to the February 1999 killings of three Yosemite National Park tourists. He is already serving a life sentence without chance of parole after pleading guilty in federal court to killing a park nature guide. Closing arguments are expected today.