A Utah mom accused of fatally drugging her husband allegedly bought hundreds of dollars of lethal fentanyl pills from her housekeeper in the weeks before the murder, according to a new report.

Kouri Richins, 33, is accused of poisoning the father of her three children – her 39-year-old husband, Eric. After his death, she wrote a children's book about dealing with grief called "Are You With Me?" 

She claimed millions in life insurance, sued his estate and spent lavishly on real estate investments, according to authorities.

But according to prosecutors, her husband died from a lethal overdose of fentanyl after it had been mixed into his drink last year.

UTAH CHILDREN'S AUTHOR SUES MURDERED HUSBAND'S ESTATE AFTER ALLEGEDLY POISONING HIM

Kouri Richins, a Utah mother of three who authorities say fatally poisoned her husband then wrote a children's book about grieving, looks on during a bail hearing Monday, June 12, 2023, in Park City, Utah.

Kouri Richins, a Utah mother of three who authorities say fatally poisoned her husband then wrote a children's book about grieving, looks on during a bail hearing Monday, June 12, 2023, in Park City, Utah. A judge ruled to keep her in custody for the duration of her trial. (AP Photo/Rick Bowmer, Pool)

Richins' housekeeper Carmen Marie Lauber, 51, has admitted to selling Richins dozens of pills on at least two occasions prior to the slaying, according to Salt Lake City's KSL-TV.

Lauber has not been charged with a crime, but her name is mentioned in court filings connected to the murder case against Richins, the outlet reported.

Split headshots of Kouri and Eric Richins

Utah author Kouri Richins allegedly tried to get her husband's life insurance benefits before his death in March 2022. Eric Richins, right, died of a fentanyl overdose in March 2022 after, police allege, his wife spiked his drink with the deadly drug. (KPCW via AP/ family handout)

"Lauber admitted to supplying Kouri Richins with 15-30 fentanyl pills on two separate occasions, approximately one month before Eric's death," according to a search warrant obtained by the station. "She stated Kouri paid her approximately $900 each time she supplied the pills."

UTAH MOM KOURI RICHINS GOOGLED ‘LUXURY PRISONS FOR THE RICH’ AFTER ALLEGEDLY KILLING HUSBAND: DOCS

Lauber was convicted in an unrelated drug case in 2021 and had been under GPS monitoring, according to the report. The drugs she allegedly supplied to Richins are believed to have been used in slaying, authorities alleged.

Kouri and Eric Richins smile together

Utah prosecutors are accusing Kouri Richins, 33, of poisoning her husband, Eric Richins, 39, with fentanyl last year at their home in Kamas outside of Park City while their three young sons were sleeping. (Facebook/ Kouri Richins)

Prosecutors allege that Richins and her husband had been feuding over money and real estate investments before his death.

The day after he died, she closed the deal on a multimillion-dollar mansion that her husband didn't want to buy, according to authorities.

UTAH CHILDREN'S BOOK AUTHOR ACCUSED OF MURDERING HUSBAND TOOK OUT $2M IN LIFE INSURANCE PRIOR TO HIS DEATH

Home of woman accused of killing husband

A house where Kouri Richins and Eric Richins lived is shown, May 11, 2023, in Francis, Utah. Kouri Richins wrote a children’s book about grief after her husband’s death and was later arrested and charged with killing him. (AP Photo/Rick Bowmer)

She allegedly purchased four different life insurance policies on her husband totaling almost $2 million between 2015 and 2017.

And on January 1, 2022, three months before his murder, she allegedly "surreptitiously and without authorization changed the beneficiary for Eric's $2 million life insurance policy to herself," according to prosecutors.

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After his death in March 2022, according to court filings, she allegedly searched Google for "luxury prisons for the rich."

Fox News' Audrey Conklin contributed to this report.