He was very good in Flowers For Algernon,
?
Maybe you mean Cliff Robertson in
Charley, which was based on
Flowers For Algernon.
Dale's last work was in 1993-94, in the tv series
Harts of the West, which I do not remember at all. The tv show that I do remember watching was
Iron Horse; I was a little too young for
Tales of Wells Fargo.