In Pursuit with John Walsh

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.

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.

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 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 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 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.