Danish inventor Peter Madsen was found guilty and sentenced to life in prison today for killing and sexually abusing Swedish journalist Kim Wall.
Prosecutor Jakob Buch-Jepsen said Madsen killed Wall, 30, as part of a macabre sexual fantasy and "tried to create the flawless crime".
Wall boarded the submarine on August 10 to report a story about Madsen, according to her family.
The judge and two lay judges, who must decide on the verdict, watched as the prosecution showed images of her mutilated body and played a selection of more than 140 internet video clips found on Madsen's computer and iPhone.
Madsen claimed that after the Swedish journalist accompanied him on the UC3 Nautilus for a planned profile, she "died when a heavy hatch escaped his grip and fell shut on her head", as NPR's Colin Dwyer reported.
A judge and two jurors at the Copenhagen City Court ruled on Wednesday that the 47-year-old Danish inventor, who had been accused of premeditated murder, aggravated sexual assault and desecration of a corpse, was guilty on all three charges.
Wall's disappearance and gruesome death drew global attention, demonstrating the risks female freelance journalists can face.
It is uncertain whether Peter Madsen murdered Kim Wall by strangulation or cutting of the throat, but there is nothing that sows doubt about whether he killed Kim Wall on objective.
This file photo taken on August 13, 2017 shows police technicians investigating the rescued private owned submarine UC3 Nautilus, in Copenhagen Habour.More news: Quickfire Amir Khan wins comeback against Phil Lo Greco in 40 seconds
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Peter Madsen has been sentenced to life in jail for the killing of journalist Kim Wall. The prosecutor had asked for a life sentence for Madsen.
Wall was 30 when she died. Weeks earlier, a naked torso that had been stabbed 15 times was recovered nearby.
The court heard how the injuries inflicted on Wall reflected the content of more than 40 violent video clips found on Madsen's laptop.
"The only thing I want to say is that I'm very, very sorry for what has happened", he said.
Peter Madsen's submarine in Copenhagen.
He also initially denied dismembering her, then confessed that he had done so and said he'd thrown her body parts into the Baltic Sea, according to the AP.
Betina Hald Engmark told a Copenhagen court she would appeal Wednesday's sentence, the longest possible against her client.
After her death, Ms Wall's family and friends set up a fund in her memory raising money to help fund young female freelance reporters.