Vallow Daybell referred to her two youngest kids as zombies, one friend testified during her trial. Chad Daybell has pleaded not guilty to the charges, and the trial is expected to take more than two months. Vallow Daybell and Chad Daybell were having an affair when both of their spouses died unexpectedly, investigators said. Vallow Daybell and Chad Daybell married just two weeks after Tammy Daybell died, surprising family members and drawing suspicion from authorities. Wood said Chad Daybell described both children as being possessed before they disappeared, and that he repeatedly predicted to friends that Tammy Daybell would soon die.