Luis Frias makes John Walsh's personal most wanted list when he allegedly murders his common-law wife in front of their kids. Then, Callahan Walsh explores the bizarre case of "Butch" Knight.

John Walsh spotlights Jihad Ramadan, who allegedly introduces a knife to a fistfight that claims a star college student's life. Callahan Walsh looks for Thayne Smika, who, police believe, shot his roommate over back rent.

An ex-Marine seems like a knight in shining armor to a single mom, but as John Walsh reveals, she was far from safe. Then, Callahan Walsh discovers how rapper Maurice Nesbitt's abuse of his girlfriend eventually turns deadly.

John scrutinizes Salvador Vaca Garcia, who tearfully appears on the local news when his girlfriend disappears. Callahan looks at Brian Keith Freeman, who allegedly slits his fiance's throat when their engagement falls apart.

John investigates a whirlwind romance and the accusation that Lamont Stephenson strangled his fiance and her dog. Later, Callahan explores police claims that Gloria Schulze is a drunk driver who repeatedly cheats the legal system.

John profiles Mike Bullinger's secret double life that police believe ended in a triple homicide. Callahan examines Tomas Magallon Gonzalez, who allegedly sexually abused his stepdaughter for years before taking her life.

John profiles Juan Lazaro Abrego, who may have murdered his ex-girlfriend, a beloved teacher. Callahan investigates Derek Dean, a St. Louis man accused of shooting a pair of identical twins, killing one and wounding the other.

John tracks the story of convicted killer Glen Stark Chambers, who beat his girlfriend to death and then escaped prison, twice. Then, Callahan investigates how Jesus Salazar avoids capture after allegedly committing murder.

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

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

John examines how Eric Jones, the son of a preacher, allegedly turned to murder. Later, Callahan tries to make sense of how a fight over a dog could provoke Ricardo Villanueva Cordova to reportedly commit murder in broad daylight.

John explores the case of con man Edgardo Perez, who allegedly preyed on older men until it turned deadly. Callahan travels to Boulder, CO, where babysitter Chris Deininger confessed to abusing 29 kids in his care before fleeing.

Host Callahan Walsh is joined by Monique Hudson, a victim's advocate at the Ponca Tribe of Oklahoma's Domestic Violence Center and close friend of murder victim, Janett Reyna, who was allegedly stabbed to death by her ex, Luis Frias.

Host Callahan Walsh gives an update about Jayme Closs, a missing child who was recovered. He's joined by Kelly Bryant, sister of Byron "BJ" Bryant, a Hampton University student who was stabbed to death in a bar brawl off campus in 2005.

Host Callahan Walsh is joined by Josephine Wentzel, whose daughter Krystal Mitchell was allegedly murdered by Raymond "RJ" McLeod in June 2016. Callahan features three new missing children, Patrick Alford Jr. plus siblings Amina and Belel Kandil.

Host Callahan Walsh is joined by Linda and Johnnie Quintero, friends of the couple at the center of this week's main story, victim Karen Garcia who was allegedly murdered by her ex-boyfriend Salvador Vaca Garcia. Callahan recaps the story of Lori Hannah.

Callahan has the latest on the Luis Frias capture and our new case - fugitive Lamont Stephenson on the FBI's Top 10 Most Wanted list.

Callahan talks to the lead investigator in the Mike Bullinger alleged triple homicide case. Take a look at this security footage where he was last seen entering the Bridger-Teton National Forest.

Juan Lazaro Abrego was Elizabeth Bowie's first boyfriend, and at first his attention thrilled her. But then he became possessive. After Elizabeth backed out of the relationship, Abrego allegedly entered Elizabeth's home and strangled her to death.

We know there's another capture right around the corner. Callahan digs into the case of Glen Chambers, who has been on the run for 29 years and could be anywhere.

In this episode, host Callahan Walsh is joined by Chyanne Paxton, whose aunt Cati Blauvelt was allegedly killed by her estranged husband, John Blauvelt. Callahan discusses the story of Rudy Fernandez and the power of social media in law enforcement.

In this episode, host Callahan Walsh discusses Lamont Stephenson's capture and talks about the Alicia Osibin case with Det. Sgt. Ian Wong of California's El Cerrito Police. Cal also covers 4 new missing children and the Frederick McLean case.

Host Callahan Walsh is joined by Brieann Lomax, whose mother, Janina Jefferson, was allegedly killed by her husband Eric Monroe Jones. Cal introduces two missing children, recaps the story of Ricardo Cordova, and answers questions from Facebook.

Host Callahan Walsh is joined by Sgt. Richard Wehby, who's leading the investigation into the murder of Gordon Machek. He also recaps the story of child molester Chris Deininger, and a mother of one of Deininger's victims reads an impact statement.