Det. Craig Whitfield speaks about his own personal tragedy and how it's impacted his work.

Delia Lerma was found stabbed to death in her own car within hours of being reported missing, but who killed her is a mystery to this day.

After her family can't get ahold of her, young mother Bethany Decker is reported missing.

Preview: When a woman was violently attacked, she miraculously survived and was able to tell her story in vivid detail.

Preview: Bethany Decker's family realized something was wrong when they found she'd left behind her purse, keys, and car during a move.