PASO ROBLES, Calf. - A gunman who ambushed officers outside a California Central Coast police station, shooting one in the head, also may have killed a homeless man found slain execution-style on nearby railroad tracks, authorities said.A hunt was underway Thursday for a suspect identified as Mason James Lira, 26, a homeless man from the Monterey area of the Central Coast.He’s believed to be the man with dark curly hair and beard who opened fire at the downtown Paso Robles Police Department before dawn Wednesday and then eluded an hours-long search.A dispatcher monitoring the department’s security cameras spotted the man.“We feel that this was an ambush, that he planned it, that he intended for officers to come out of the Police Department.