Lloyd Lee Welch will go on trial in September 2017 for the murders of Sheila and Katherine Lyon although their bodies have never been found. Investigators finally believe they know what happened to the young sisters who vanished almost 40 years ago.

The Investigation Continues

Episode 5: The Mountain

The 1975 disappearance of two young sisters from a suburban Maryland shopping mall traumatized the nation's capital, upending a family and the community's sense of security. More than 40 years later, the Lyon sisters bodies have never been found, but a man is set to stand trial for their murders.

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The Investigation Continues