My condolences on your recent loss. I think that this might be the recipe you are looking for:

BETTER THAN ROBERT REDFORD

Bottom layer:
2 cups flour
1 cup margarine, melted
2 cups finely chopped pecans
Mix well and pat in bottom of 9x13 inch baking dish. Bake at 350 deg. for 20 min.

Middle layer:
2-8oz. cream cheese
2 cups sugar
Blend well and fold in 6 oz. Cool Whip. Spread mixture over cooled crust

Top layer:
Mix 3 small boxes instant butter pecan pudding, following directions on box. Spread over cheese mixture. Top with 6 oz. Cool Whip and sprinkle with nuts and/or Heath Bar crumbles.
Refrigerate overnight.