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:

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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