Police are investigating the death of a man whose body was found in a Hilton in midtown Manhattan.

According to the NYPD, at 4:10 a.m. this morning, officers responded to a 911 call about an unconscious man at the Hilton Garden Inn at 63 West 35th Street. Apparently a security guard noticed the door to the hotel room was open. The cops "discovered the male, unconscious and unresponsive, under a mattress with trauma to the back of the head."

The man, believed to be in his 30s, was taken to Bellevue Hospital, where he was pronounced dead.