20/20

When a dedicated Army nurse disappears, her father begins his own desperate search. Investigators discover a complex web of jealousy, violence and a Marine harboring dark secrets.

A college student is murdered at home; investigators uncover evidence from a string of sexual assaults; a survivor who helped authorities catch the killer speaks out for the first time.

A beloved hairstylist vanishes without a trace, launching a multistate investigation that ultimately uncovers a chilling trail of deception.

After a 24-year-old mother is brutally shot and killed outside her workplace, real-time surveillance video helps detectives uncover clues that lead to a suspect whose own confession suggests a possible mastermind still at large.