THIS is the disturbing moment that police burst into a man’s home to find him killing his parents – before the cops shoot him dead.

The horrifying New Year’s Day bloodbath unfolded in Utah as unwitting authorities stumbled upon Erik Bertelsen, 35, stabbing his mother and father to death.

Bodycam footage from the brutal incident in the West Valley City shows police approaching the Bertelsen house before storming in and discovering the unimaginable horror.

Erik can be seen crouched over parents Terrie, 63, and Kerry, 67, with a knife, plunging his blade into them repeatedly.

As the authorities burst into the scene, Erik is visibly surprised and stops in shock, revealing the bloody weapon in his equally bloody hand.

Terrie and Kerry cannot be properly seen in the clip, as their bodies are obscured by a chair or obscured by the police because it’s too upsetting to show.

In the heat of the moment, one cop can be heard yelling: “Show me your f***ing hands! Show me your hands! Get your hands up!”

Erik ignores the order, and continues to slash away at one of the victims.

The cop then shoots Erik, but he can still be seen moving in the clip.

Between his heavy and shocked breaths, the cop shouts “If you do not drop that knife, you will get shot again!”

It was at this point that an officer can be seen shooting two more rounds into the killer, who slumps forward.

This mortally wounded Erik.

His partner tells him to “take a deep breath, dude” as the traumatic event left the Bertelsen parents butchered, and their son Erik lying dead on top of them.

The Bertelsens’ step-daughter, Chasity Ulibarri, told KMYU that she “kinda felt like something was going to happen” before the savage killings.

She commented: “I sent the cops over here for a welfare check four days ago because I knew he would keep taking their phones, and it wasn’t them that was answering me.”

West Valley City Police Chief Colleen Jacobs said: “I see a tragedy, a very tragic incident that happened with the parties involved, and for the officers involved as well.

“[The] suspect was known beforehand.

“We have a history, where we have been out to the house before, and where the officer is now on paid administrative leave.”

Jacobs further commented that the police officers involved are “pulling through” after the “traumatic event.”

Erik was a reported meth addict who had a long history of criminal behavior.

Most recently, Erik had been arrested three days before Christmas for “running outside of his house and on the road in front of his house wearing only his boxers”, according to a police booking affidavit reviewed by KSL-TV.

In 2009, he was arrested or strutting around his own house party with a painted face and two big knives, telling guests that “someone was going to be stabbed, the devil is here, and he is going to kill,” a police booking affidavit said.

He was convicted of two counts of aggravated assault and spent nine months in the Salt Lake County Jail, plus three years on probation.

He was also convicted of kidnapping a year later when he wouldn’t let a former girlfriend leave his house after an argument — then threatened to kill her.

A judge sent him to jail for another six months, and hit him with another three years probation.

Just five days before slaughtering his parents, Erik had been paroled for frequently violating his parole over the span of a decade, the West Valley Police Station said.