The Danish inventor Peter Madsen has admitted dismembering the body of Swedish journalist Kim Wall aboard his submarine, but denies killing her.
Danish police said in a statement that he also admitted dumping her body parts in the sea.
He told police she had died in August from carbon monoxide poisoning inside the submarine, while he was up on deck.
Previously he said a hatch had smashed her head. Divers found her head and other body parts earlier this month.