Lori Vallow Daybell, already serving life for the murders of her two children and romantic rival, is back in court Monday for a separate trial in Arizona, charged with first-degree murder in the 2019 death of her fourth husband, Charles Vallow.

He was fatally shot by her brother, who later died and was never charged. Vallow Daybell, 51, is representing herself and has pleaded not guilty.

She previously claimed in an interview that she was wrongly convicted and believes she and her husband, Chad Daybell, will be exonerated, NBC News has reported.

She also faces another charge in a separate attempted murder plot.

Written by B.C. Begley