Yeah, as I recall the story was they witnessed drug deliveries into Mena when Slick Willy was gooberner of Arkansas. They wound up dying and their cause of death was ruled to be “natural causes”. IIRC, one of them was decapitated by a train.
Thats what I recall from seeing the Clinton Chronicles some years ago.
There were copies of the Clinton Chronicles still available online the last time that I looked for it a couple of years ago; a very telling docuflick on the Clintoons.