Her headless torso was found floating in waters off Copenhagen on August 21, 11 days after she went missing.
Self-taught engineer and inventor Peter Madsen, 46, has been accused of Wall’s death, with prosecutors saying he dismembered her body before throwing it overboard.
Madsen, who is married and has been in custody since August 11, claims Wall died when a 70-kilo (154-pound) hatch door fell on her head, and in a panic, he threw her body overboard.
He has insisted her body was intact at the time.
But Jensen said the decapitated head contradicted Madsen’s version of events.
There is “no sign of fracture on the skull and there isn’t any sign of other blunt violence to the skull,” he said, citing an autopsy carried out overnight.