A man died Sunday afternoon after being struck by a vehicle near NW 21st Avenue and NW 79th Street in northwest Miami-Dade, authorities said. The crash was reported shortly before 12:30 p.m. The vehicle remained at the scene, and Miami-Dade Fire Rescue responders determined the man had died. The Miami-Dade Sheriff’s Office Traffic Homicide Unit is investigating. Authorities have not said what caused the crash, and it was not yet clear whether the driver would receive a citation or face charges.