Peter Madsen has been charged with the murder of Swedish journalist Kim Wall, a Danish prosecutor has said.
The inventor is thought to have killed Ms Wall on his private submarine in August, during a trip in which she was interviewing him for an article.
She was reported missing after failing to return home from the trip on the 60ft Nautilus vessel, which then sank off the coast of Copenhagen.
Mr Madsen, who was rescued from the sinking vessel, has been held on suspicion of negligent manslaughter.
He initially claimed he had dropped Ms Wall off on an island, before saying she had died after an accident on the submarine.
He then later admitted to dismembering her body but has continued to deny murder, as a torso and other body parts confirmed as Ms Wall’s were found near the submarine’s route.
Madsen has also been charged with indecent handling of a corpse, dismemberment, and having sexual relations with Wall of a “particularly dangerous nature”.
Prosecutor Jakob Buch-Jepsen said it is believed that he cut Ms Wall’s throat or strangled her. He described the case as “very unusual and extremely disturbing”, adding that the killing is believed to be premeditated and that prosecutors will argue that Madsen should spend the rest of his life in prison.
There is a simultaneous secondary claim that Madsen be placed in a secure mental facility for as long as he is deemed sick and a danger to others by psychiatrists.
Kim Wall was a respected freelance journalist who had written for publications such as the New York Times, Harpers and the Guardian from countries including Haiti, Cuba and China.
“She was dogged in her pursuit of important and sometimes quirky stories,” the International Women’s Foundation, who awarded her a grant, said. “She was adored by those who knew her.”
Madsen’s trial has been set for 8 March and a verdict is expected by 25 April.