Lori Vallow Daybell is currently on trial for the murder of her two children, “J.J.” Vallow and Tylee Ryan, and Tammy Daybell, the late wife of her husband, Chad Daybell. 48 Hours revisits how investigators found Lori Vallow Daybell's missing children – buried on Chad Daybell’s property. "The Final Days of JJ and Tylee” originally aired on October 3, 2020. Lori Vallow and Chad Daybell, who is also charged in the killings, have pleaded not guilty. Chad Daybell will be tried separately. Prosecutors say the couple’s so-called doomsday beliefs played a role in the murders. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.