In Pursuit with John Walsh

Luis Frias makes John Walsh's personal most wanted list when Frias allegedly murders his common-law wife in front of their kids. Then, Callahan Walsh explores a bizarre case: Harold "Butch" Knight leaves clues after confessing to killing his wife.

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

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

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

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

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

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

John Walsh tracks the story of convicted killer Glen Stark Chambers, who beat his young girlfriend to death and then escaped prison twice. Then, Callahan Walsh investigates how Jesus Salazar avoids capture after allegedly committing murder 20 years ago.

John Walsh profiles John Blauvelt, a troubled U.S. Army vet who is accused of waging a lethal war against his young wife. Later, 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 Alicia 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 McLean's capture.

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

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