Kim Isabel Fredrika Wall[3] was reported missing after Nautilus failed to return to the harbour at Refshaleøen, Copenhagen.

Convicted of her murder, Madsen was sentenced to life imprisonment on 25 April 2018 by Copenhagen City Court[4] following a widely publicised trial.

[17][18][19] Police probed possible links to other murder cases in Scandinavia, including the unsolved death of 22-year-old Kazuko Toyonaga in 1986 in Copenhagen, but did not find connections to any of them.

[20][21][22] Madsen was arrested upon being rescued from Køge Bay after Nautilus foundered on August 11 and was charged with negligent manslaughter.

[23][24] Madsen initially stated that he had dropped Wall off on land,[25] but then admitted to dumping her body at sea after she died in what he claimed was an accident on board Nautilus.

[23][24] He testified in a court hearing on 5 September that Wall died after being struck on the head by the submarine's hatch cover.

[29][30] Madsen subsequently changed his story, admitting to dismembering Wall's body but continuing to deny intentionally killing her, saying that she may have died after poisonous exhaust gases entered the submarine while he was on deck.

The bomb squad was deployed, and Madsen was surrounded and apprehended by police 500 metres (547 yd) from the prison and taken back into custody.

[43][44] In October 2017, Wall was posthumously nominated for Prix Europa's Outstanding Achievement Award "Journalist of the Year".

[48] Also in 2018, Wall's boyfriend Ole Stobbe related his experiences with the media coverage about the case in Danish newspaper Weekendavisen.

It features Søren Malling as chief inspector Jens Møller, Pilou Asbæk as special prosecutor Jakob Buch-Jepsen, Rolf Lassgård and Pernilla August as Wall's parents, and Laura Christensen as investigator Maibritt Porse.