He is buried within the Muscogee (Creek) Nation boundaries.
Craig T. Nelson, his co-star in
Poltergeist II - L'altra dimensione (1986), happened to be passing through the area and wanted to pay his
respects. He drove around for four or five hours trying to find the cemetery
when he finally stopped at a corner store and asked where Sampson
was buried. As it turned out, the man standing next to Nelson in the
store was Sampson's cousin, and told Nelson he'd show him the spot. It
was cicada season, and Nelson remembers the buzzing was overwhelming.
He approached Sampson's grave and said something to the effect of "Hey
Will, it's Craig". Within three or four seconds, Nelson recalls, the
sound of the cicadas tapered off and stopped entirely.