Wall, who was researching a story on inventor Peter Madsen, went missing after he took her out to sea in his 17-metre (56-foot) submarine on August 10.
Mr Madsen, who designed and built the submarine, was charged with negligent manslaughter and is in detention.
Miss Wall had met the Dane to interview him about the sub before she was reported missing on August 11. An hour and a half later, the pair were pictured in the conning tower - the part of the submarine that sits above water when at surface level - by a man on a nearby cruise ship. He was in custody when Wall's torso was found.
For the following weeks, police searched for the 30-year-old Swedish freelance journalist who Madsen said he had dropped her off alive in Copenhagen at a restaurant. It was then that the outside world learnt Madsen's version of events - that an accident occurred on board, Wall died and Madsen "buried" her at sea somewhere in Koge Bay, about 50km south of Copenhagen.
The headless torso was found in shallow water along the beach by a passing cyclist.
Wall travelled the world in search of "human stories" and had a 'knack for the quirky, ' her friend and former classmate said.
A female torso without legs, arms or a head was found by a passer-by, said the head of the investigation, Jens Moller Jensen.
DNA from the torso matched that from Ms Wall's hairbrush and toothbrush.
On Wednesday, police confirmed an autopsy conducted on Tuesday night revealed metal attached to the torso and that "the body bears the mark of having, most likely, been inflicted deliberate damage with the goal of ensuring that gasses can pass out of the body - possibly in an attempt to avoid that a body rises from the seabed".
The investigator said marks on the torso indicated that someone had tried to press air out of the body so that it wouldn't float. They are still looking for the rest of her body.
Following the discovery of CCTV tapes from the area where he claimed he left Wall, Madsen changed his story, telling the authorities that the journalist had died in an accident on board his submarine and that he dumped her body in the sea.
"No matter what, we find it very positive that she has been found now", she added. He said the sub later sank when it developed a ballast tank problem.
The inventor is dubbed "Rocket Madsen" in a 2014 biography with the same title because he created the Rocket-Madsen Space Lab, funded by donations and which aimed to send privately built rockets into space. When investigators had the sub raised, there were no remains found in the sub, but blood was discovered.
A self-taught aerospace engineer, Madsen was one of a group of entrepreneurs who founded Copenhagen Suborbitals, a private consortium to develop and construct submarines and manned spacecraft. The first launch of his 40-ton, almost 18-meter-long (60-foot-long) UC3 Nautilus in 2008 made global headlines.
A day after taking Wall out on his UC3 Nautilus submarine, the inventor was rescued after the vessel sank.
Her father was a photojournalist for Expressen for many years and her brother also works as a photojournalist for Swedish publications, Moreno said. The tragedy has hit not only us and other families, but friends and colleagues all over the world.
The Committee to Protect Journalists said it was "shocked and saddened" by Wall's death.