Preheat oven to 325 F.
Melt butter in large saucepan over medium heat. Remove from heat. Stir in cocoa.
Stir in 1 1/2 cups granulated sugar, chopped walnuts, 6 tablespoons flour, 3 beaten eggs and 3/4 teaspoon vanilla. Spoon into the pie shell.
Combine cream cheese, remaining sugar and the egg and beat until creamy. Stir in the remaining flour and vanilla.
Dollop cream cheese mixture on top of filling; swirl with tip of a knife to marbleize.
Bake until set, about 35 minutes. Cool on a wire rack. Chill, covered, for 2 - 4 hours.
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