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

When Tom Evans, 67, stepped into a Phoenix courtroom, it was not as a juror but as an observer. The case has consumed his thoughts for years, he said.

Lori Vallow Daybell is already serving life sentences in Idaho for murdering her two youngest children and conspiring to kill her lover's wife.