Police received multiple reports of gunfire in the 28000 block of Cole Place beginning at 12:44 a.m.
Responding officers found the two victims in front of a residence suffering from gunshot wounds. Both men were transported to Eden Medical Center in Castro Valley, where one man died.
The second victim is expected to survive his injuries, Orrey said.
Police said neither of the victims had been positively identified as of this morning, but that both men appear to be in their 20s.
Witnesses described the gunman as a Hispanic man in his 20s, of medium height and with a thin build. He was wearing a gray hooded sweatshirt, police said.
A motive for the shooting hasn't been determined and no suspects have been identified, police said.
Anybody with information about the shooting is asked to call Inspector Bob Coffey at (510) 293-7083 or Hayward police dispatch at (510) 293-7000.