He initially told reporters that he had returned Ms. Wall to shore the night before. After her torso was found on Aug. 23, however, Mr. Madsen said that she had died aboard his submarine in the hatch accident and that he had buried her at sea.
A forensics report showed that her limbs had been removed by force and that she had been stabbed many times. Her head and missing clothes were found on Oct. 6, but the head showed no sign of trauma like those Mr. Madsen had reported.
Investigator Jensen told reporters on Monday that the forensic evidence did not initially support Mr. Madsen’s claim of carbon monoxide poisoning, but that the police had now asked experts for an additional evaluation.
The police were still searching for Ms. Wall’s arms and the cellphones of Ms. Wall and Mr. Madsen, both believed to have been thrown overboard.
The trial of Mr. Madsen is expected to begin in March. He has also been preliminarily charged with abuse of a corpse and “sexual relations under aggravating circumstances.”
During a court hearing in September, the prosecutor Jakob Buch-Jepsen said the police had found a hard drive belonging to Mr. Madsen with videos showing the torture and killing of women. The videos did not appear to have been made by the inventor, Mr. Buch-Jepsen said.
“The videos indicate that one may have an interest in fetish, torture and murder,” he said in court. “These are some very grave videos with women recorded abroad.”
Ms. Wall, 30, was a freelance journalist from Trelleborg, a port town in southern Sweden. She studied at the London School of Economics and at Columbia University in New York, and her articles had appeared in several publications, including The New York Times.
After her death, friends and family started raising money to establish a grant in her name for “a young female reporter to cover subculture, broadly defined, and what Kim liked to call ‘the undercurrents of rebellion.’ ”