The Wallet Nobody Was Supposed to Find - Episode 86

The Couples Who Vanished on the Parkway: The Colonial Parkway Murders of Four Young Couples in Virginia

A car hung off a riverbank embankment at a 45-degree angle, stopped only by a bush. Inside, two women were dead — throats slit, diesel fuel poured over them, unlit matches scattered nearby. The killer had tried to burn the evidence and failed. That was 1986. Three more attacks followed. The bodies kept disappearing. The evidence kept going cold. And for 36 years, no one knew his name.

In this episode, we explore a one-inch piece of nautical rope found in a victim's hair that pointed investigators toward a very specific type of suspect, a phantom ranger in an unmarked white car pulling couples over on a darkened parkway, and two victims from 1988 who have never been found — not even their remains. Was this a single killer refining his method across four attacks, or something investigators still cannot fully explain? The forensic science and the timeline raise questions that decades of investigation have not fully answered.

Case Details

Victim: Kathleen Thomas, 27, stockbroker and Naval Academy graduate; Rebecca Dowski, 21, college student; Robin Edwards, 14; David Knobling, 20; Cassandra Haley, 18; Richard Keith Call, 20; Anna Maria Phelps, 18; Daniel Lauer, 21.

Date: October 1986 through September 1989.

Location: Colonial Parkway and surrounding areas, Virginia, USA.

Case Status: Alan Wade Wilmer Sr. was named as the suspect in the Knobling and Edwards murders in January 2024 following a DNA match. Wilmer died in 2017 and cannot be prosecuted. The remaining cases are officially unsolved and active.

Episode Key Points

- The killer poured diesel fuel on the first victims and struck matches — diesel requires a much higher ignition temperature than gasoline, meaning the fire never started and evidence was preserved by accident.

- A one-inch piece of nautical rope found in Kathleen Thomas's hair led the FBI's Behavioral Analysis Unit to profile the suspect as a waterman — someone who worked boats and handled fillet knives professionally.

- Keith Call and Sandy Haley vanished in April 1988 with no bodies ever recovered — three separate tracking dogs independently indicated the same two spots in the water, but divers found nothing.

- Alan Wilmer Sr., the man DNA evidence links to the 1987 murders, had no felony record and no DNA in any law enforcement database — he was only identified because his remains required DNA testing when his body was found decomposing alone in his home in 2017.

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