Const. Eric Czapnik's alleged murderer told paramedics the officer's death wouldn't have happened if he'd given up his gun, according to testimony Wednesday.

Craig MacInnes said he and three other paramedics saw a man get out of a silver car at the Ottawa Hospital's Civic campus with something brown in his hand around 4:30 a.m. Dec. 29, 2009.

He said he ran out of the triage room when he noticed someone "on top of Czapnik . . . appeared to be making sharp little punches or movement of his arm."

After the paramedics were able to separate the two, he said "there was a lot of blood running . . . (Czapnik) looked at me in disbelief with big bulging eyes . . . I told him to go inside the hospital."

Czapnik died of those stab wounds, suffered in the hospital parking lot that Tuesday morning as he sat in his cruiser.

MacInnes said Kevin Gregson told him afterwards that "it didn't have to end this way; all he had to do was give me his gun."

The paramedic said upon being put in Czapnik's cruiser by him and three of his colleagues, Gregson "seemed normal; he wasn't angry, he wasn't happy, he wasn't sad."

Jury gets to see clothing worn that night

Jurors had a chance to inspect bloodstained clothing belonging to both Czapnik and Gregson from that night.

Czapnik's blood-soaked, bullet-proof vest had cuts above the right breast pocket and was passed around the jury wrapped in plastic.

The Crown also presented a white body armour vest they said Gregson was wearing at the time of the murder with blood stains on the neck.

They said blood was also found on a double-edged knife that was found on Gregson when he was arrested, as well as blood on the gloves he was wearing.

He was wearing two body armours, "military-style" green pants, black boots and black gloves and carrying a picture of his family when he was arrested.

Pictures were also shown of Gregson in a hospital gown after his arrest with blood stains on his face, chest and hands, with stitches on his neck.

The Crown said Gregson confessed to the murder in a videotaped police interview, which the jury will be able to see.

Gregson pleaded not guilty to the charge of first-degree murder on Monday as his trial began.

With a report from CTV Ottawa's Catherine Lathem, who is live-tweeting the trial.