Kouri Darden Richins, the Utah woman who published a children's book about grief, has been found guilty of his murder by poisoning him with fentanyl.

March 17 (UPI) -- Kouri Darden Richins, the Utah woman who published a children's book about grief, has been found guilty of his murder.

Richins, 35, was found guilty of all charges -- first-degree aggravated murder, attempted aggravated murder, forgery and insurance fraud -- in the death of Eric Richins, 39, of a fentanyl overdose.

Eric Richins died on March 4, 2022, in their home in Kamas, Utah, near Park City.

The jury took about three hours to deliberate Monday. Sentencing is scheduled for May 13, and she faces 25 years to life in prison.

"Honestly, I feel like we're all in shock. It's been a long time coming," Eric Richins' sister, Amy Richins, said after the verdict, CBS News reported. "So just very happy that we got justice for my brother."

Kouri Richins poisoned Eric Richins by mixing him a Moscow Mule, which she spiked with nearly five times the lethal amount of fentanyl. But a couple months before that, she asked her housekeeper to find her "elicit street drugs" and made her husband a poisoned sandwich on Valentine's Day 2022 that made him ill.

In closing arguments prosecutor Brad Bloodworth said Kouri Richins was "intensely ambitious" and her real estate business was in a "death spiral." She wanted a divorce but the prenuptial agreement would have left her with very little money, Bloodworth said.

Richins allegedly forged her husband's signature on four life insurance policies before he died.

Defense attorney Wendy Lewis argued that Eric Richins suffered from pain and could have brought illicit drugs home from a trip to Mexico. She said Kouri Richins' business was in trouble, but that Eric Richins' income made him "worth so much more to Kouri alive than dead."

Within a year of her husband's death, Kouri Richins commissioned a ghost-written children's book "Are You with Me?" about grief and dealing with death.

The three-week trial began in February and included 13 days of testimony at the Summit County Courthouse in Park City, Utah. The defense didn't call any witnesses, and Kouri Richins did not testify.