When an Illinois couple and their young children are murdered in an act of profound violence, investigators struggle to find anyone who might’ve wanted to harm the well-liked family. A decades-long investigation explores multiple possibilities, including the involvement of serial killers, in this episode of Last Seen Alive.

Sources used to research this episode:

Gruesome Murder of an Illinois Family Remains Unsolved as The Main Suspect is Executed (Bob Cyphers and Sara Bannoura / KMOV4 News)

St. Louis Post-Dispatch from St. Louis, Missouri · Page 6, 11/21/1987 ed. (via newspapers.com)

13-Year Vigil of Fear Eases in Illinois Town (Flynn McRoberts / The Chicago Tribune)

Through the Window: The Terrifying True Story of Cross-Country Killer Tommy Lynn Sells (Diana Fanning / St Martin’s Press)

How Serial Killer Ángel Reséndiz Used Railroads To Target, Murder His 9 Victims (Benjamin H. Smith / Oxygen.com)

‘Railroad Killer’ Executed in Texas (NBC News)

Tommy Lynn Sells (Michael Newton / The Encyclopedia of Serial Killers)

St. Louis Post-Dispatch from St. Louis, Missouri, Feb. 18th, 2001 · Page 15

The Coast to Coast Killer (Lisa Marie Fuqua via medium.com)

Killer Smile (John Macccormack / Dallas Observer)

If you know anything about the murders of Keith, Elaine, Peter and Casey Dardeen, please contact the Jefferson County Sheriff’s Office at 618-244-8004.

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