Authorities are investigating the death of a homeless man who was found unconscious on a subway in Manhattan early Tuesday, police say.
Police responding to a 911 call found the unidentified man unconscious in one of the cars on a downtown E train at the World Trade Center station around 4:30 a.m., authorities said.
He was pronounced dead at a hospital.
Police say there were no obvious signs of trauma. They say it appears he may have had a heart attack, but an autopsy will be conducted to confirm how he died.
