How He Killed Sarah Stern! VIDEO!!

Video footage released Thursday shows a struggling New Jersey artist accused of murdering his childhood friend recounting the gory details of how he strangled her.

“It took me a half-hour to kill her,” Liam McAtasney can be heard saying in the video played in New Jersey Superior Court Thursday, and published online by the Asbury Park Press.

“I thought I would be able to choke her out and have her out in like a couple of minutes.

“I choked her out and then she was just lying there having a seizure or something…so then I had a shirt and I just shoved it down her throat so she wouldn’t throw up or anything and had my finger over her nose.”

The clip was covertly recorded by Brooklynite Anthony Curry, a friend of 21-year-old McAtasney, at the behest of cops.

McAtasney told his pal about his plan around Thanksgiving 2016 to kill and rob 19-year-old Sarah Stern of a load of cash she’d recently inherited from her mother, Curry testified.

After hearing that Stern was missing in early 2017, Curry said he realized McAtasney hadn’t been joking and agreed to record him describing what he did to Stern.

“I don’t feel any different,” McAtasney told Curry after describing for him how he killed Stern.

“I don’t think about it. You always think you’re going to try new things and change. It just don’t do anything.”

“It’s your life,” he adds. “You might as well make it one. You gonna live some boring-a– life?”

In the recording, McAtasney says that after the murder, he left Stern’s body slumped over the toilet in the bathroom of her home in Avon because he had to go to work.

Then, he called his roommate Preston Taylor to hide the body in the bushes, he says.

McAtasney then describes how he and Taylor got rid of the body by tossing it off the Route 35 Bridge in Belmar.

“I got up on top of the bridge to throw her off. My plan was, I was going to throw her off, run over, jump over the divider and get in Preston’s car… I go up, open the door, unhook her, pull her out and start dragging her to throw her over and then cars start coming,” McAtasney is heard saying.

Stern’s car was left abandoned at the bridge, which prosecutors say was an attempt to make it look like she’d jumped.

McAtasney and Taylor were nabbed on Feb. 1, 2017, two months after the murder, and Taylor, 21, spilled his guts to detectives.

He pleaded guilty to a slew of charges for his role in Stern’s death — and testified against McAtasney as part of a cooperation agreement with prosecutors. He faces between 10 and 20 years.