“Doomsday” mom Lori Vallow’s brother told detectives he believes that she murdered her third husband, who reportedly died of natural causes, in addition to her fourth husband and two children, new court documents revealed. Vallow’s brother Alex Cox told detectives he believes that Vallow and Alex murdered Vallow’s third husband Joseph Ryan, who had purportedly died of a heart attack in 2018. Alex had killed Vallow’s fourth husband, Charles Vallow, in July 2019 shooting in what he said was self-defense. She faces a charge of conspiracy to commit murder in Arizona in connection with his death.