Kim Wall was a 30-year-old Swedish journalist at the start of a promising career when she was invited to interview inventor Peter Madsen aboard his homemade submarine.
He has admitted dismembering her body and tossing the parts into the sea - all of which were recovered - but denies killing Wall.
She said Madsen did not give "a trustworthy" explanation.
Wall, 30, who wrote for The New York Times, The Guardian and other publications, set out on the submarine on a sunny August evening past year to interview Madsen, the co-founder of a company that develops and builds manned spacecraft.
Madsen and Engmark have 14 days to decide whether to appeal against the verdict to Denmark's supreme court.
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The prosecution relied on the autopsy, technical findings on the submarine, and explicit content on Madsen's computer to back up its claim that he murdered Wall as part of a sexual fantasy.
However the forensic pathologist determined that some of Ms Wall's wounds were inflicted while she was alive or very shortly after she had died.
When he was arrested he had flecks of Wall's blood on his nostrils, scratches on his forearms, and traces of semen in his underpants.
The court was shown some content found on Madsen's laptop, including downloaded animated and so-called snuff films of women being impaled, hanged and beheaded on his laptop. "It's the same as films you've seen, Jakob." he said to the prosecutor.
While the cause of death is not absolutely certain, Wall's lungs have signs of "mechanical asphyxia" caused by suffocation or slitting of the throat. "It is the task of the prosecutor to prove that he is guilty", she said in her final argument before the court room.
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In summing up on Monday, the prosecutor told Copenhagen City Court that Madsen, 47, should be given a life sentence, which is usually an average of 16 years in Denmark.
In his final arguments on Monday, prosecutor Jakob Buch-Jepsen argued that Madsen had tortured and then murdered Wall to fulfil his violent sexual fantasies, in a case "so bad and disgusting that you as a prosecutor have no words to describe it".
"There can not be any doubt about guilt in this case", Jepsen said as he called for life imprisonment which in Denmark averages 16 years.
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.
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