At 12:17 a.m., Hayward police received a call about a man down in the 25000 block of Gading Road. Arriving officers found the person on the roadside, police said.
He was pronounced dead at the scene, police said.
Police said a cause of death could not be immediately determined. Anyone with information about the case is asked to call the Hayward Police Department at (510) 293-7000.