A Utah mother who published a children’s book about grief after the death of her husband and was later found guilty of killing him has been sentenced to life in prison without the possibility of parole. Kouri Richins, 35, wearing a lime green uniform in court, stared ahead as the sentence was handed down on Wednesday, on what would have been her husband Eric Richins’s 44th birthday. In March, Kouri Richins was convicted of aggravated murder in Eric’s 2022 death after prosecutors say she secretly slipped five times the lethal dose of fentanyl into a Moscow Mule cocktail she made for him. A year after the murder, Richins wrote a children’s book to help their three sons process the loss. The 35-year-old real estate agent was millions in debt and planning a future with another man, prosecutors said during her trial. She had opened numerous life insurance policies on her husband without his knowledge, and falsely believed she would inherit his estate worth more than $4 million after he died.…