Madsen, who was known for his crowdfunded submarines and rockets before becoming a murderer, was convicted of the 2017 killing of Kim Wall, a 30-year-old Swedish journalist. Madsen sexually assaulted her while she was on board his submarine for an interview, Danish prosecutors said. He then dismembered her body — severing her limbs, head, and torso. The submarine sank in what police said might have been an attempt to destroy evidence. Authorities eventually recovered Wall’s body.