A man was struck and killed by a large truck in Union City around 10:40 a.m. Saturday while crossing the intersection of Mission Boulevard and Lafayette Avenue on foot, according to the Union City Police Department. Police arrived to find the man seriously injured and unconscious. He was transported to Eden Medical Center, where he later died. Police did not immediately identify the man, whom they described as elderly. The driver of the truck remained on the scene and was cooperative with law enforcement officials, police said.