A man accused of killing a woman on a cruise ship gave a chilling confession to FBI agents, according to newly-released court documents.

Jason Watford, 48, was arrested on Monday over the death onboard the MSC Seascape, a huge cruise ship with 2,270 cabins that can host nearly 5,900 guests.

The ship was forced to turn around and return to port after a woman, who has not yet been identified, was found dead in her room with multiple facial injuries. She was killed Sunday after the ship left Galveston , Texas , per an FBI affidavit filed in federal court.

A housekeeper knocked on the cabin door to deliver towels and saw the woman lying motionless on the floor, according to the affidavit.…