A man died after being struck by an F train near West Fourth Street on Saturday afternoon, the NYPD said.

When cops arrived, they found the victim under a subway car inside the tunnel; the man was unconscious and had severe trauma to his head, police said. 

Travelling on a southbound train, the victim fell 100 feet from the station at 3:05 p.m., MTA spokesman Kevin Ortiz said. "Apparently the person was walking between cars," he said. 

The victim, whose age and name have not been released, was prounounced dead at the scene, and an investigation remains ongoing, police said.