Author Kouri Richins has been sentenced to life in prison without parole for poisoning her husband, Eric Richins, with a lethal dose of fentanyl.Prosecutors proved she committed the murder, alongside forgery and fraud, to inherit the victim's 4 million dollar estate and resolve her mounting business debts.During sentencing, the couple's three sons expressed severe fear and distrust, successfully urging the court to deny any future possibility of release.