A Utah mother pens a children's book about grief, only to be charged with her husband's murder. This gripping "48 Hours" episode investigates the suspicious death of Eric Richins, the multiple life insurance policies, the lavish mansion purchased after his death, and a chilling handwritten letter from jail. Join Natalie Morales and Betsy Shuller on "Post Mortem" for a deep dive into this shocking case that will leave you questioning everything. #48Hours #KouriRichins #TrueCrime