In Pursuit With John Walsh

Luis Frias makes John Walsh's most-wanted list after allegedly stabbing his common-law wife to death in front of their children; Callahan Walsh explores the case of Harold Butch Knight, who left a trail of clues after confessing to killing his wife.

John Walsh spotlights Jihad Ramadan who allegedly stabbed a fellow university student to death; Callahan Walsh looks for Thayne Smika who reportedly shot his roommate in cold blood over back rent.

John searches for Erik Arceneaux, a prime suspect in the murder of a devoted single mom, whose family needs justice; Cal learns the dark truth behind Mark Blevins, an accused sexual predator who has been on the run for over 30 years.

John joins the hunt for Brian Ontiveros, who police believe killed his ex-girlfriend in a fit of jealousy; a woman's mysterious death has Cal join police in the search for Robert Kuehn, who's been in the wind since 2013.

When a young woman is murdered, police suspect her boyfriend Carlos Torres, but before his trial, Torres cuts off his ankle monitor and flees; Cal joins the hunt for Bill Brockbrader, a child predator wanted for failure to register as a sex offender.

A woman's murder leads police to suspect her husband, and former prison pen pal, William Plemons, who's been on the run since 2003; Cal joins the hunt for suspected murderer and arsonist Darryl Walker in Georgia.