Lori Vallow and Chad Daybell were convicted of killing her daughter Tylee and son J.J. Here's everything to know about their crimes and lives today.

Lori Vallow Daybell was convicted of killing two of her kids, and her only surviving child, Colby Ryan, says his siblings' murders "changed the way I view people."

Vallow Daybell tells veteran host Keith Morrison on the episode of "Dateline" airing on March 7 that she believes she and her husband, Chad Daybell, are innocent of the crimes. “I will be exonerated," she said in an excerpt of the show. "We will both be exonerated in the future.”