Police said the victim suffered trauma to his mid-section.
Fresno Police responded after someone called 911 to report an unconscious man laying in the grass. Officers and fire fighters tried to resuscitate the man, but he was taken to the hospital where he was pronounced dead.
Police said the man was found just outside his own apartment. They say they have identified him, but they are not yet releasing his name.
"We are, right now, checking everywhere in this area for witnesses, especially with neighbors," said Lt. Mike Doyle with the Fresno Police Department.
There was an incident in the same area on Saturday where police were called, but investigators are not sure yet if the cases are connected.