Lori Vallow Daybell, the Idaho mother accused of killing her two youngest children and and husband’s late wife, thought that her kids were “zombies,” her former best friend testified on Thursday.

Vallow Daybell is accused along with her husband, Chad Daybell, of murder in connection with the deaths of Joshua “JJ” Vallow, 7, and Tylee Ryan, 16, who was last seen a few days before her 17th birthday in 2019. Melanie Gibb, a former close friend recalled when Vallow Daybell told her she thought her kids were zombies.

Gibb testified that it was Chad Daybell who first told Vallow Daybell, then Gibb, that they believed Vallow Daybell’s oldest daughter, Tylee Ryan, became a zombie when she was 12- or 13 years old, but they only discovered this when she was 16, East Idaho News reported.

Gibb’s comments came after Vallow Daybell’s defense team asked District Judge Steven Boyce to strike Gibb’s earlier testimony to prosecutors citing the defense didn’t receive new testimony. The judge declined the request.

Gibb is considered a key witness in the trial that has already heard tearful testimony from Kay Woodcock, JJ Vallow’s grandmother, and gruesome descriptions of finding the kids’ remains from a police detective who was leading the investigation into their disappearance.

The deaths have drawn widespread scrutiny, speculation, and sensationalism that spawned a Netflix docuseries. Vallow Daybell could spend life in prison if convicted on charges of conspiracy, murder, and grand theft. Chad Daybell, who will be tried separately, could face the death penalty.

Vallow Daybell and her husband are accused of killing Chady Daybell’s previous wife, Tammy Daybell. Vallow Daybell also faces charges in Arizona of conspiracy to commit murder in connection with the death of her former husband, Charles Vallow, who was killed by her brother, Alex Cox.