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.

Opening statements in Lori Vallow Daybell's trial in Arizona began Monday. She is charged in the death of her fourth husband, Charles Vallow.

Thursday marked the fourth day of testimony in the Lori Daybell trial in Maricopa County. Daybell is accused of conspiring to kill her fourth husband, Charles Vallow, with the help of her brother. Alex Cox shot and killed Vallow in July 2019,

In the first week of the Arizona vs. Lori Vallow Daybell trial, prosecutor Treena Kay called 12 witnesses to the stand and Vallow Daybell presented her argument as her own defense attorney.

Day three of the Lori Daybell murder conspiracy trial began with a cross-examination of retired homicide detective, Daniel Coons, on the stand.