John Walsh profiles John Blauvelt, a U.S. Army vet who is accused of waging a lethal war against his young wife. Callahan Walsh looks at Rudy Fernandez, whose teen romance with his high school sweetheart is believed to have turned deadly.

Alicia Osibin's neighbors trusted her, but John Walsh looks at whether she may be responsible for her own mother's murder. Callahan speaks with Andrea, alleged victim of Frederick McLean's abuse, who is still desperate for McLean's capture.

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John is in pursuit of William Strand -- police say he killed his ex-girlfriend who was also the mother of his son. Later, Cal hunts for Leslie Lagrotta, a suspect accused of sexually assaulting women in central Florida for over a decade.

John is in pursuit of suspect Jonathan Dorado, wanted for killing a woman and her unborn child in an act of misplaced gang revenge; Cal hunts for Henry Houston, accused of conning a vulnerable woman and later killing her father in an altercation.

When a man is senselessly gunned down at a party, police learn it may be a case of mistaken identity; John joins the hunt for suspect Colin Jerrick; Cal helps police hunt David Bonness, accused of sexually abusing his former stepdaughter.

John joins the search for Celina Mays, whose disappearance draws police attention to her family-run, allegedly cult-like church; Cal hunts for Efren Meza, who was accused of stalking and stabbing his ex-girlfriend.

When a young girl goes missing after a night out in Vegas, police suspect her friend Erick Rangel-Ibarra; Cal goes after Jerold Dunning, accused of sexually abusing his girlfriend's daughter for years.