Submarine owner Peter Madsen is accused of killing Swedish journalist Kim Wall. File picture: Niels Hougaard /Ritzau via AP

Copenhagen, Denmark — Danish inventor Peter Madsen stands accused of tying up and torturing Swedish reporter Kim Wall before he either cut her throat or strangled her during a trip on his private submarine in August.

Madsen, 47, whose trial starts Thursday in Copenhagen, is charged with murder, dismemberment and indecent handling of a corpse for the way he disposed of Wall's body.

Madsen has denied murder. His defense lawyer, Betina Hald Engmark, told TV2 Thursday that he maintains she died accidentally inside the submarine. He has admitted throwing her body parts into the sea.

The prosecution claims Wall's murder was premeditated because Madsen brought along tools he normally didn't take when sailing.

The trial at Copenhagen's City Court ends April. 25.

The submarine UC3 Nautilus which belongs to Danish inventor Peter Madsen.
The submarine UC3 Nautilus which belongs to Danish inventor Peter Madsen in Copenhagen, Denmark. File picture: Dorothee Thiesing/AP

Read more on this story:

Danish submarine owner charged with killing reporter

Danish inventor admits dismembering journalist

Divers find missing body parts of Swedish journalist #KimWall

No sign of reporter who disappeared from submarine

Torso of journalist who vanished off submarine found in sea