Benjamin Hoffmann's fourth and final alleged victim sustained 69 injuries across his body, including 36 "stab or slicing" injuries in a "struggle" that led to his death, a court has heard.
Mr Hoffmann is accused of killing four men, Hassan Baydoun, Michael Sisois, Nigel Hellings and Robert Courtney, during an alleged shooting spree across Darwin on June 4, 2019.
He has pleaded not guilty to all charges.
Forensic pathologist Marianne Tiemensma told the jury she conducted autopsies on 33-year-old Mr Baydoun and 52-year-old Mr Courtney.
Dr Tiemensma said Mr Courtney had 69 injuries to his body, including multiple blunt force injuries and "pellet tracks" from gunshots to his right arm and right thigh.
Dr Tiemensma said, in her opinion, the slice and stab wounds were the ones that led to Mr Courtney's death.
She said Mr Courtney was a "large muscular man" who prior to his death was "healthy and strong".
Dr Tiemensma told the court she visited the Jolly Street recycling centre where Mr Courtney was allegedly murdered and said it was "covered in blood".
Court hears about Baydoun's injuries
Dr Tiemensma said Mr Baydoun had four separate gunshot wounds: two to his right arm, one "large gunshot wound" to his chest and a fourth to his head.
She said the chest wound, from a shot fired from about 1 metre away, injured Mr Baydoun's sternum, heart, blood vessels, lungs, and liver.
Dr Tiemensma told the jury she believed the "close range" shot to Mr Baydoun's head was the fourth and final shot, likely about 10 to 15cm away.
Dr Tiemensma said she visited the Palms Motel room where Mr Baydoun's body was found and that based on her observations, the alleged murder victim was likely to have been shot in the arms and chest while standing and then shot in the head after he slumped down into a sitting position.
DNA links Hoffmann to crime scenes
The jury also heard DNA from where Mr Baydoun and Mr Courtney were allegedly murdered was "a hundred billion times" more likely to be that of Mr Hoffmann than anyone else.
Joannah Lee, director of NT Police's forensic science branch, told the jury she conducted DNA analysis on a "large range of items", matching samples to the DNA of the four alleged victims and to Mr Hoffmann.
The court heard Dr Lee analysed DNA from the Palms Motel (where prosecutors allege Mr Hoffmann murdered Mr Baydoun) and at a recycling centre on Jolly Street (where prosecutors allege Mr Hoffmann killed Mr Courtney).
Dr Lee said DNA from these two scenes were "at least 100 billion times more likely to have occurred if it originated from Benjamin Hoffmann, than if it originated from an unknown individual".
The court heard police investigators recovered 50 shotgun cartridge shells, both fired and unfired, after the alleged shooting spree.
Knife and gun also tested for DNA
Dr Lee said she also analysed DNA from the knife and the gun found in the white ute Mr Hoffmann had been driving at the time of his arrest.
The court heard that the knife, which was found in the ute's tray, matched DNA from both Mr Hoffmann and Mr Courtney.
Dr Lee said traces of Mr Hoffmann and Mr Courtney's DNA were found on the knife's handle and blade.
Mr Courtney's blood was also found on the left hand of Mr Hoffmann, who was swabbed following his arrest.
Dr Lee said the Winchester shotgun returned positive results for both Mr Courtney and Mr Hoffmann's DNA.
The trial is scheduled to run for nine weeks.
