Sheriff says he may not have known he'd shot drug backpacker, who died. Criminal investigators have determined that a U.S. Border Patrol agent who shot and killed a drug backpacker last Saturday was not being threatened at the time, officials with the Santa Cruz County Sheriff's Department said Friday. The agent, though, may not have known he had shot somebody, said Santa Cruz County Sheriff Tony Estrada. The dead man, Julio Cesar Yenez Ramirez, 31, from Nogales, Sonora, was shot through the right arm and the bullet pierced his heart and lung, exiting through the left armpit, Estrada said. He...