Tylee Ashlyn Ryan and Joshua Jaxon "J. J." Vallow were two American children from Chandler, Arizona, who disappeared in September 2019, later being found buried in shallow graves in Rexburg, Idaho, on June 9, 2020. Their remains were located in the backyard of Chad Daybell, who was their mother's lover at the time of their death and had become her husband by the time their bodies were found. Chad Daybell was an apocalyptic author and publisher and Lori had come to share his idiosyncratic religious beliefs. Tylee was last seen alive at Yellowstone National Park on September 8, 2019, while her younger adopted brother J.J. was last seen alive on September 22, 2019.