Jury selection is set to begin today in the triple-murder trial of Yosemite National Park killer Cary Stayner. A judge has set aside several weeks to pick a jury. Stayner could be sentenced to die if he´s convicted of slaying three park tourists and is found to have been sane at the time. Stayner has plead innocent by reason of insanity in the 1999 killings. If the jury convicts Stayner but decides he is insane, he would be sentenced to a mental institution. The trial was moved to San Jose because of extensive news coverage near Yosemite and in California´s Central Valley. Stayner already is serving life in a federal prison for beheading Yosemite nature guide Joie Armstrong. He´s facing state charges in the killings of Carole Sund, her daughter, Juliana, and family friend Silvina Pelosso of Argentina.