'My hands were on her neck,' Garnier says in video at Catherine Campbell murder trial

Christopher Garnierput his hands on Catherine Campbell's throat and heard her last gasps before she died, a jury heard Thursday as they watched avideo recording of his 2015 police interrogation athis second-degree murder trial in Halifax.

Det.Const. MichelleDooks-Fahieasked about the reasons Garnier heard "two gasps" before Campbell died.

"My hands were on her neck,"Garnierresponded,addinghe didn't know for how long.

The Crown allegesGarnierstrangledCampbell an off-duty police officer with the Truro Police Servicein an apartment onMcCullyStreet in central Halifax, then transported her body in a green compost bin to a steep embankment near the Macdonald Bridge.

Garnier is on trial in Nova Scotia Supreme Court in Halifax for second-degree murder and interfering with human remains. He has pleaded not guilty to both counts.

RCMPCpl. JodyAllison, one of the officers who interrogatedGarnier, testified Thursday that he didn't know the cause of Campbell's death when he started the interview. All he knew, he said, was that anautopsy was underway.

The defence has suggested her death was accidentaland the result of a consensual sexual encounter involving choking.

On Thursday, the jury finished watching the 9-hour video of Garnier's interrogation following his arrest on Sept. 16, 2015, hours after Campbell's body was found.

'She wasn't moving': Christopher Garnier interrogation video

7 years ago

Duration 12:11

Christopher Garnier describes hearing Catherine Campbell's last breaths in 2015 interrogation video.

Toward the end of the video, Garnier said he punched Campbell possibly three times and might have already have had a hand on her throat at that point. When asked by investigators why he did it, Garnier said he didn't know.

Police also asked if Campbell struggled but Garnier said he didn't remember, although he wondered if a possible struggle might explain why his neck chain was missing. As the interrogation went on, police told Garnier he couldn't have "blackouts of convenience."

Garnierwrote to Campbell's family

About 8hours into the interview, police left Garnierin the room alone with a pen and piece of paper.He took a long drink of water, huggedhis arms into his stomach and gazedtowardthe floor before picking up the pen.

Garnier, who later told the officers the letter was addressed to Campbell's family, wrote, "I never wanted this to happen" and "I don't expect you to forgive me for what happened, so I won't ask for forgiveness."

Another part of it read: "If I could give my life to get hers back I would."

Earlier in the interrogation, Garniertold police he remembered Campbell lying on a mattress in the apartment, her face covered in blood. He repeatedly said he did not know why her face was bloody.

He told police he heard her take her last breaths, but struggled to remember details of the night she died.

"I don't know how this happened," he said at one point. "I've been trying to remember what happened."

Garniersaid hedidn't rememberhow Campbell got on amattress or what became of itafterward, but he did remember there was blood all over the back of it. Police never found the mattress.

Garniertold police that Campbell was dead when she was placed in the compost bin.When asked how he knew,Garniersaid she wasn't moving or breathing.

The trial will resume next week.

Blair Rhodeslive bloggedfrom court. Mobile users can view the blog here.