Reuters/BI Danish inventor Peter Madsen has been sentenced to life in prison for killing journalist Kim Wall. Madsen invited Wall to board his home-made submarine last August. He was the last person to see her alive. Gruesome details of Wall's death have emerged over the past few months. Warning: Readers may find details of the case disturbing. An eccentric Danish inventor has been sentenced to life in prison for killing Swedish journalist Kim Wall. Peter Madsen, a 47-year-old entrepreneur and aerospace engineer, was the last person seen with Wall after he invited her on his home-made submarine last August.See the rest of the story at Business InsiderNOW WATCH: What Trump University was really like — according to a former professorSee Also:The Toronto van attack suspect warned of an 'incel rebellion' on Facebook hours before the attack — here's what that meansJames Comey says he pities Trump: 'I don't dislike him — I actually feel sorry for him as a person'Russia is pushing these 15 mutually contradictory theories to claim they weren't behind the nerve agent attack