A hiker made a grisly discovery in a Queens park Tuesday afternoon, stumbling on the body of a man who cops believe was murdered, police said.

The victim, Hispanic and in his 20s, was found in a marshy area of Kissena Park near 161st Street just after noon. He did not have any identification and appeared to have suffered severe trauma to the head.

The city Medical Examiner’s Office will determine the cause of death.