Documents: Mom called kids ‘zombies’ before their deaths

A boy checks out a memorial for Tylee Ryan, 17, and Joshua "JJ" Vallow, 7, at Porter Park in Rexburg, Idaho on Thursday, June 11, 2020. (John Roark/The Idaho Post-Register via AP)

FILE - This file booking photo provided by the Rexburg (Idaho) Police Department shows Chad Daybell, who was arrested June 9, 2020. Daybell, of Idaho, who is charged with destroying evidence after police said the bodies of two missing kids were found on his Idaho property has pleaded not guilty. Daybell's attorney, John Prior, filed documents notifying the court of Daybell's not-guilty plea late last week. He said Daybell requested a preliminary hearing and a jury trial. (Rexburg Police Department via AP, File)

FILE - In this March 6, 2020, file photo, Lori Vallow Daybell glances at the camera during her hearing, with her defense attorney, Edwina Elcox, right, in Rexburg, Idaho. The bodies of two children uncovered in rural Idaho are a boy and his big sister who have been missing since September, relatives said Wednesday, June 10, bringing a grim end to a search that captivated people worldwide. Authorities have not released the identities of the bodies discovered on the property of Chad Daybell, who married the children's mother, Lori Vallow Daybell, a few weeks after the kids were last seen. Both their mother and her husband are behind bars. (John Roark/The Idaho Post-Register via AP, Pool, File)

FILE - In this Tuesday, June 9, 2020, file aerial photo, investigators search for human remains at Chad Daybell's residence in the 200 block of 1900 east, in Salem, Idaho. Court documents say authorities used cellphone information from the now-deceased uncle of two missing Idaho children to find the youths' bodies on Daybell's rural property. Daybell and the children's mother, Lori Vallow Daybell, are in custody. (John Roark/The Idaho Post-Register via AP, File)

BOISE, Idaho — The case of two kids who were missing for months before they were found dead in rural Idaho has taken another bizarre twist, with new court documents alleging that their mother believed they were zombies and that she was on a mission to rid the world of such creatures.