A 58-year-old pedestrian was struck by a vehicle and killed Thursday while he was walking in an unmarked crosswalk in Otay Mesa, San Diego police said. At 4:53 p.m., the man was crossing from west to east on the south end of Avenida Costa Este at Avenida De La Fuente, police said in a statement. A 38-year-old man driving a Toyota Tacoma westbound on Avenida De La Fuente made a left-hand turn onto Avenida Costa Este, hitting the pedestrian, who was pronounced dead on the scene, the police statement said. The victim’s name was not released. Drugs and alcohol were not suspected of being a factor, police said. The crash remained under investigation.