A longhaul truck driver from Texas who became obsessed with a software engineer in Washington state after meeting her through a social media chatroom app killed her, her husband and himself after stalking them for months, police said.Zohreh Sadeghi, 33, and her husband, Mohammad Milad Naseri, 35, were shot to death in their suburban Seattle home by Ramin Khodakaramrezaei, 38, according to Redmond Police Chief Darrell Lowe.