A tooth fragment has been discovered on the property of accused killer Patrick Frazee, seven months after his fiancee disappeared without a trace.

That tooth will now be tested for DNA after Judge Scott Sells approved the prosecution's motion for consumptive evidence testing, a process used on smaller sample that ultimately results in their destruction.

It is unclear when or how that fragment was found, but it is known that Frazee's mistress Krystal Kenney had shown authorities the spot where she alleges Berreth's body was burned by Frazee.

Kenney also told police that Frazee dislodged Berreth's teeth from her skull when he bludgeoned her with a baseball bat inside her own home on Thanksgiving.

She went on to claim that she found some of those teeth while cleaning the murder scene one day after the fatal ambush.

Frazee entered a plea of not guilty to charges including first degree murder last month, and could be facing the death penalty if convicted of that most serious offense.

Accused: A tooth fragment was found on the farm where Patrick Frazee (above in December) lives with his mother, prosecutors revealed on Friday

Glimmer of hope: That tooth will be DNA tested by the Colorado Bureau of Investigation to see if it it is a match to Kelsey Berreth (above with daughter Kaylee), who has been missing since November

The arrest warrant states that Frazee then left the murder scene untouched for two days, refusing to clean the blood from Berreth's home and instead having Kenney scrub the floors and search for the young mother's missing teeth.

After Krystal was finished, she and Frazee watched Berreth's body burn together on his farm, according to the court filing.

That filing also reveals that Frazee and Berreth's 17-month-old daughter was in her playpen in the next room while her father allegedly killed her mother.

Commander Chris Adams of the Woodland Park Police Department wrote in the affidavit that Kenney provided details of the crime after she was approached by agents from both the Federal and Colorado Bureau of Investigations.

'Frazee used a baseball bat to kill Berreth in the living room of [her] residence on November 22nd of November, 2018,' states the filing.

'Frazee had tied something around Berreth's eyes, and was having her guess the scents of different candles.

'While she was blindfolded and distracted, he hit her with the bat, causing her death.'

It goes on to state: 'Frazee was concerned he left a tooth behind in the residence, because when he hit her in the face with the bat, it presumably caused several of her teeth to be dislodged.'

Krystal told police that she later found the tooth and disposed of it while cleaning the crime scene.

In the two days between Frazee killing Berreth and burning her remains, he had been keeping the body in a black tote hidden away on the Nash Ranch according to Krystal.

Star witness: Frazee's mistress Krystal Kenney (above in court earlier this year) told police that Frazee bludgeoned Berreth and dislodged her teeth in the process before burning her body on his farm

Gregg Slater testified earlier this year that Frazee killed Berreth on Thanksgiving and then called Kenney, telling her that 'she had a mess to clean up'.

Krystal then drove 13 hours overnight from Idaho to Colorado, where she cleaned Berreth's blood-soaked house for four hours, it is claimed.

Frazee meanwhile left the murder scene to have Thanksgiving dinner with his family and then allegedly returned to collect Berreth's body and burn it on a pile of haystacks at a nearby farm said Slater.

Prior to that, Frazee had asked Krystal to kill Berreth four times, and she almost carried out those orders on two occasions, said Slater.

The first time was in September, when she befriended Berreth by pretending to be a neighbor and then gave the woman a drug-laced beverage from Starbucks, it is claimed.

Frazee then asked her to bludgeon Berreth with a bat and beat her to death with a pipe, which Krystal told agents she almost did, backing out when she arrived at Berreth's home and saw she was not alone, the court heard.

Krystal had been in Reno on the fourth occasion and could not book a ticket to fly in to Colorado, said Slater.

Slater said that the mistress did all this because she feared for her life and the lives of her two children.

Krystal did not carry out Frazee's final order either, according to Slater, opting to leave two patches of blood as evidence in the house for authorities to find when they searched for evidence.

She then went to eat at a nearby Sonic.