In April 2018, Madsen was convicted of the 2017 murder of Swedish journalist Kim Wall on board his submarine, UC3 Nautilus, and sentenced to life imprisonment.
Pada April 2018, Madsen dinyatakan bersalah atas pembunuhan wartawati Swedia, Kim Wall, di dalam kapal selamnya, UC3 Nautilus, dan dijatuhi hukuman penjara seumur hidup.