Lori Vallow Daybell ’s brother told jurors Thursday at her Arizona trial that he believes she was behind the killing of her estranged husband.Adam Cox, a witness for the prosecution, said Charles Vallow’s 2019 shooting death outside Phoenix occurred just before the two men planned an intervention to bring her back into the mainstream of their shared faith in the Church of Jesus Christ of Latter-day Saints.

Adam Cox, a witness for the prosecution, testified that he had "no doubt" his two siblings conspired to kill Charles Vallow.

Everything leading up to the shooting of Charles Vallow, Adam Cox testified, convinced him it was a conspiracy.

Day 4 of the Doomsday Murder trial in Phoenix began with prosecuting attorney Treena Kay's cross-examination of Adam Cox, the brother of the late Alex Cox. During his testimony, Adam talked about some of Lori Vallow Daybell's religious beliefs that are considered to be outside of what is accepted by the Church of Jesus Christ of Latter-Day Saints.

She is accused of conspiring to kill her former husband Charles Vallow. Prosecutors allege a potential motive tied to a $1 million insurance policy.

Lori Vallow Daybell cross-examined one of the state's most important witnesses on day three of her murder conspiracy trial in Phoenix. The so-called "Doomsday Mom" is accused of conspiring to kill her then-husband,