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.
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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