New testimony reveals chilling details in "Doomsday cult" murder trial.

A friend of Lori Vallow Daybell testified in court that Vallow Daybell believed some people were possessed by evil spirits and labeled them as "dark." Vallow Daybell and her fifth husband, Chad Daybell, are accused of using their religious beliefs to justify the deaths of anyone who stood in the way of their romantic relationship, including Vallow Daybell's two youngest children and a romantic rival. Both are charged with murder, conspiracy, and grand theft charges. Vallow Daybell's friend's testimony revealed that Vallow Daybell's fourth husband was shot and killed by her brother, who claimed it was self-defense.