S4 E1 • Episode #93

Legend: Rendlesham Forest Incident. Murder: Shane Stewart and Sally McNelly. Lost loves: The Mother of Carla Downing

Première diffusion : 18 septembre 1991

S4 E2 • Episode #94

Mystery: John Wilkes Booth. Wanted: Art Silva. Missing: Alex Cooper. Update: "Wanted: Melody Martin/Missing: Paloma Gibson"

Première diffusion : 25 septembre 1991

S4 E3 • Episode #95

Mystery: Tyler. Wanted: Joe Maloney. Legend: The Shroud of Turin. Murder: Ethel Kidd. Update: "Wanted: Art Silva"

Première diffusion : 2 octobre 1991

S4 E4 • Episode #96

Wanted: Connecticut River Valley Killer. Wanted: Judge John Fairbanks. Lost loves: Paul and Paula Scribner. Update: "Lost loves: Duncan Gilmore".  Update: "Mystery: Tyler"

Première diffusion : 9 octobre 1991

S4 E5 • Episode #97

Missing: Baron 52. Wanted: David O'Neil. Wanted: Paul Stamper. Wanted: Josephine White. Update: "Lost loves: Martha Hinkle"

Première diffusion : 16 octobre 1991

S4 E6 • Episode #98

Missing: Tommy Gibson. Wanted: Jim Burnside. Lost loves: John Novotny. Murder: Gary Gibson. Update: "Mystery: Tyler"

Première diffusion : 23 octobre 1991

S4 E7 • Episode #99

Legend: The Ghosts of the St. James Hotel. Legend: The Ghost of Harden House. Missing: Mary Ann Perez. Wanted: Dr. John Anderson

Première diffusion : 30 octobre 1991

S4 E8 • Episode #100: The Diabolical Mind

Mystery: James Fox; Elliott Leyton; Reid Maloy. Wanted: Marie Hilley. Mystery: G. Daniel Walker. Murder: Joan, Michelle and Christe Rogers

Première diffusion : 3 novembre 1991

S4 E9 • Episode #101

Mystery: Sharon Johnson. Murder: Roger Dean. Wanted: Liza Montgomery. Missing: Deborah Poe and Donna Callahan/Murder: Darlene Messer. Missing: Arthur Jones. Update: "Wanted: Joe Smith"

Première diffusion : 6 novembre 1991

S4 E10 • Episode #102

Mystery: John Catchings Missing: Sherry Eyerly. Murder: Kathy Bonderson. Mystery: Sarah DiGennaro. Mystery: The Mad Butcher of Kingsbury Run (repeat from February 20, 1991)

Première diffusion : 10 novembre 1991

S4 E11 • Episode #103

Wanted: Televangelist Bomber. Lost loves: Savior of Cathy Loving. Murder: Beverly McGowan. Wanted: Robin Stevens and Sherry Seymour. Update: "Mystery: Ryan Stallings"

Première diffusion : 13 novembre 1991

S4 E12 • Episode #104

Legend: Belgium UFO. Murder: Robert Hamrick. Wanted: Philip Breen. Lost loves: Ellie Taylor, Patrick Ackles and Fred Gardner. Update: "Lost loves: The Mother of Carla Downing"

Première diffusion : 20 novembre 1991

S4 E13 • Episode #105

Murder: Jeffrey Digman. Wanted: Bo Tanner. Lost loves: The Mother of Barbara Smith and Barbara Ratner. Wanted: Church Arsonist. Legend: Trabuco Treasure. Update: "Wanted: Paul Stamper". Murder: Teresita Basa (repeat from April 25, 1990)

Première diffusion : 27 novembre 1991

S4 E14 • Episode #106

Wanted: Michael St. Clair and Dennis Reese. Mystery: Dan Tondevold. Lost loves: Annie Ellen Currie. Missing: Joey Moss/Wanted: Jerry Moss. Update: "Lost loves: Melvin and Daniel Nellis". Update: "Wanted: Robin Stevens and Sherry Seymour"

Première diffusion : 4 décembre 1991

S4 E15 • Episode #107

Murder: Chad Maurer. Lost heirs: Lorene Roberts. Wanted: Emma Figueroa. Wanted: Luis Herrera, Pedro Pumajero, Jose Rubio, Eduwigis Escalante, and Juan Carlos Pereira. Lost loves: Heath Brian Vess. Update: "Lost loves: John Novotny"

Première diffusion : 11 décembre 1991

S4 E16 • Episode #108

Mystery: Larry Race. Wanted: Warner Child Killer/Murder: Warner Jane Doe. Wanted: Pat Farmer/Missing: Jared Peters. Lost loves: Helen Rose. Update: "Wanted: Jim Burnside"

Première diffusion : 18 décembre 1991

S4 E17 • Episode #109

Wanted: Philip Fraser. Missing: Billy Joe Neesmith, Keith Wilkes and Franklin Brantley (the crew of the Casie Nicole). Lost loves: The child of W. B. "Mac" McDonald. Wanted: William John Wood

Première diffusion : 15 janvier 1992

S4 E18 • Episode #110

Lost loves: Madeline and Ada Underwood. Wanted: Todd Mueller. Wanted: Connecticut River Valley Killer (repeat from October 9, 1991). Murder: Kathy Bonderson (repeat from November 10, 1991)

Première diffusion : 29 janvier 1992

S4 E19 • Episode #111

Legend: Medjugorje Miracles. Wanted: Levia Koropolous/Missing: Nicholas Koropolous. Missing: Angela Hammond. Missing: Lee Young

Première diffusion : 5 février 1992

S4 E20 • Episode #112

Lost loves: Daughter of John Elias and Eleanor Platt. Wanted: James White. Legend: The Yeti. Mystery: Stanton Bones. Update: "Wanted: Robin Stevens and Sherry Seymour"

Première diffusion : 12 février 1992

S4 E21 • Episode #113

Mystery: Wytheville UFO Sightings. Wanted: Charles Warren Boomer aka The Satchel Bandit. Wanted: Ohio prostitute killer. Legend: Beaty Castle. Update: "Missing: Joey Moss". Update: "Wanted: Dale Hyde". Update: "Wanted: John Irwin". Update: "Wanted: Gregory Barker". Mystery: Robert Kennedy Assassination (repeat from May 16, 1990)

Première diffusion : 19 février 1992

S4 E22 • Episode #114

Wanted: Valley Bank Robbery. Lost loves: Angeline Dewey. Wanted: Cheryl Holland. Update: "Lost loves: Heath Brian Vess"

Première diffusion : 26 février 1992

S4 E23 • Episode #115

Wanted: Pizza Restaurant Robbers. Lost loves: James Russell, Darlene and Davida Ebmeier, Thomas Manion, Steve Madding, Rita Madding, and Pamela Madding. Update: "Wanted: Paul Stamper". Update: "Lost loves: The Child of W. B. "Mac" McDonald". Missing: Baron 52 (repeat from October 16, 1991). Wanted: Josephine White (repeat from October 16, 1991)

Première diffusion : 4 mars 1992

S4 E24 • Episode #116

Wanted: Richard Minns. Lost heirs: Heirs of Katherine Bennett. Wanted: Sergio Farina/Missing: Marcus Farina. Update: "Missing: Alex Cooper"

Première diffusion : 18 mars 1992

S4 E25 • Episode #117

Mystery: Santos Family. Missing: Thomas Gibson (repeat from October 23, 1991). Update: "Wanted: Jim Burnside" (repeat from October 23, 1991). Update: "Lost loves: John Novotny" (repeat from October 23, 1991)

Première diffusion : 1 avril 1992

S4 E26 • Episode #118

Murder: Marie Lilienberg and Maria Wahlen. Lost loves: The Family of Joe Soll. Wanted: Tom Dixon/Murder: Gary Simmons. Wanted: Richard Condia. Update: "Mystery: The Disappearance of Amelia Earhart". Update: "Lost loves: The Sisters of Jackie Dragon"

Première diffusion : 8 avril 1992

S4 E27 • Episode #119

Murder: Jeanne Tovrea. Wanted: Judge John Fairbanks (repeat from October 9, 1991). Mystery: Sherry Eyerly and John Catchings (repeat from November 10, 1991). Mystery: Sarah DiGennaro (repeat from November 10, 1991)

Première diffusion : 15 avril 1992

S4 E28 • Episode #120

Murder: Vallejo Armored Car Murders. Update: "Wanted: Liza Montgomery". Murder: Roger Dean (repeat from November 6, 1991)

Première diffusion : 22 avril 1992

S4 E29 • Episode #121

Legend: Noah's Ark. Murder: Tracy Wofford-Bunn. Lost loves: Dolores Stradt. Missing: Colleen Reed. Update: "Wanted: Levia Koropolous/Missing: Nicholas Koropolous"

Première diffusion : 29 avril 1992

S4 E30 • Episode #122

Murder: Doug Johnston. Wanted: Rochester Car Heist. Lost loves: Robert Brown. Murder: Chaim Weiss. Update: "Wanted: James White"

Première diffusion : 6 mai 1992

S4 E31 • Episode #123

Wanted: Betty Field/Missing: Christophe Day. Update: "Wanted: Cheryl Holland". Wanted: Televangelist Bomber (repeat from November 13, 1991). Lost loves: Savior of Cathy Loving (repeat from November 13, 1991). Murder: Beverly McGowan (repeat from November 13, 1991)

Première diffusion : 13 mai 1992

S4 E32 • Episode #124

Murder: Bill Henderson. Mystery: Wytheville UFO Sightings (repeat from February 19, 1992). Wanted: Charles Warren Boomer aka The Satchel Bandit (repeat from February 19, 1992). Mystery: Robert Kennedy Assassination (repeat from May 16, 1990)

Première diffusion : 17 mai 1992

S4 E33 • Episode #125

Murder: Scott Johnson. Update: "Lost loves: The Friends of Charlie Best". Legend: Belgium UFO (repeat from November 20, 1991)

Première diffusion : 20 mai 1992

S4 E34 • Episode #126

Lost loves: Michelle Fazzani. Wanted: Tom Dixon/Murder: Gary Simmons (repeat from April 8, 1992). Murder: Vallejo Armored Car Murders (repeat from April 22, 1992)

Première diffusion : 12 août 1992

S4 E35 • Episode #127

Missing: George Owens. Update: "Murder: Bill Henderson". Murder: Doug Johnston (repeat from May 6, 1992)

Première diffusion : 19 août 1992

S4 E36 • Episode #128

Lost loves: The Siblings of Jim Boumgarden

Première diffusion : 2 septembre 1992

S4 E37 • Episode #129

Wanted: Sal Guardado. Update: "Lost loves: Michelle Fazzani". Murder: Tracy Wofford-Bunn (repeat from April 29, 1992)

Première diffusion : 9 septembre 1992