Video has been released of the first police interview given by a Missouri woman sentenced to life in prison without parole for the murder of a mentally disabled man.

Pamela Hupp, 60, of O'Fallan, was convicted of murder last week for fatally shooting 33-year-old Louis Gumpenberger.

Authorities believe Hupp killed Gumpenberger as part of a bizarre attempt to frame Russell Faria, who was acquitted of the murder of his wife and Hupp's friend Betsy.

After having his conviction thrown out and spending four years in jail, Faria alleged that Hupp was responsible for the murder and cited that she was a beneficiary of the dead woman's life insurance.

In the video, obtained by Fox 2 after Hupp's conviction, she describes shooting Gumpenberger - whom she claimed was a home invader - in self-defense.

'I just started shooting him, walking towards him, because I wanted to be sure I hit him,' Hupp is seen telling police.

'So once [Gumpenberger] opened the door and he was there, I just started shooting, walking towards him, until I didn't have any more [bullets].'

Video has been released of the first police interview given by Pamela Hupp, 60, of O'Fallan, Missouri, who was recently sentenced to life in prison without parole for the murder of a mentally disabled man

The video shows Hupp describing how she shot 33-year-old Louis Gumpenberger - whom she claimed was a home invader - in self-defense in August 2016

Police discovered Hupp (left) lured Gumpenberger (right) to her home by pretending to be a producer of NBC's Dateline. It is believed Hupp wanted to frame the husband of her dead friend, Betsy Faria, for the murder

Courtesy of KTVI

In the video, Hupp had just gone to the headquarters of the O'Fallon Police Department voluntarily to recount what had happened.

Hupp tells officers that Gumpenberger attacked her in her driveway with a knife,

'He goes b****, we're going to the bank and we're getting Russ's money, and he starts getting all agitated and excited,' she said.

'I thought he was drunk or on drugs or something...I hit his arm with the knife and then shot out of the car and ran inside.'

Officers later learned that 'Russ' was Russ Faria, who was convicted for the brutal stabbing death of his wife, Betsy, in 2013 - two years after she was found dead in a pool of blood on the living room floor.

But four years later, the conviction was overturned and he was acquitted in a 2015 retrial.

Faria blamed Hupp, saying she had a motive after becoming the beneficiary of a $150,000 life insurance policy shortly before Betsy was killed.

Feeling that Faria's acquittal was drawing attention towards her, authorities believe Hupp wanted to frame Russ by creating a hoax revenge attack.

Days before the killing, a woman reported someone matching Hupp's description claiming to be a producer for Dateline and promising to pay $1,000 if she would record a scripted sound bite about 911 calls (pictured)

Betsy was stabbed to death in 2011 and her husband, Russell, was first convicted but later acquitted. Pictured: Russell, second from left, is hugged by his aunt after Hupp pleaded guilty to first-degree murder, June 2019

Gumpenberger, who was mentally and physically impaired from a 2005 car wreck, would become the victim of the bizarre plot when Hupp approached him on August 16, 2016.

Claiming to be a presenter for the popular NBC crime show Dateline, she asked Gumpenberger to participate in reenacting a 911 emergency call.

But after inviting him into her home, she shot Gumpenberger twice, killing him.

But the story was quick to unravel. Days before the killing, a woman had reported someone matching Hupp's description claiming to be a producer for Dateline and promising to pay $1,000 if she would record a scripted sound bite about 911 calls.

Russell claimed Hupp had murdered his wife because she benefited from Betsy's $150,000 life insurance policy. Pictured: Betsy

The woman at first agreed, but backed out when the woman failed to show any credentials.

St Charles County prosecutor Tim Lohmar said a surveillance camera showed the SUV's license plate, which matched Hupp's. He has said authorities believed Hupp was 'vetting a potential victim.'

Officers also discovered that Hupp bought the knife that Gumpenberger used to 'attack' her at Dollar Tree.

Data from Hupp's cellphone also indicated that Gumpenberger was not a stranger as Hupp had claimed - GPS showed she was at his apartment less than an hour before the fatal confrontation.

Lohmar said that after Hupp was arrested in Gumpenberger's death she stabbed herself with a ball point pen multiple times in the neck and arms in the O'Fallon police station, requiring hospitalization.

A phone message left with Hupp's attorney was not returned.