A man beheaded a woman at her Long Island apartment Tuesday night and dragged her out into the street where he kicked her severed head about 20 feet before jumping in front of a train, cops and witnesses said.

The woman, who appeared to be in her 60s, was discovered dead outside an apartment building in Farmingdale at around 8 p.m. Tuesday, Nassau County police said.

“I looked through my window and saw the body down there,” said neighbor Nick Gordon.

“I saw the lady laying right in front and her head was across the street, close to the corner. I thought ‘holy sh–!'”

Gordon said the gory scene extended out into the street from inside the apartment building.

“There was blood all over the floor,” he said. “You can see smears going down the stairs… as if somebody were pulling a body.”

Some of the neighbors thought the headless body in the street was a Halloween prank, only to lift the lifeless body and discover it was real, witnesses said.

The man was struck and killed by a LIRR train about 25 minutes later. His body was found about a mile from the Farmingdale apartment, cops said.

Nassau County Police did not identify the names of the deceased. According to WNBC, the woman is the man’s mother.