BOISE, Idaho (AP) — Prosecutors accused a man of conspiring with his new wife to keep the bodies of her children hidden on his rural Idaho property, adding to the charges he faces in the strange case that involves the couple's doomsday beliefs and the mysterious deaths of their former spouses.

In new charges filed Tuesday evening, prosecutors say Chad Daybell conspired with wife Lori Vallow Daybell to keep hiding the bodies of 7-year-old Joshua "JJ" Vallow and 17-year-old Tylee Ryan because they knew the remains would likely be used as evidence in a court case.

The children vanished in Septemb...