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Combine butter and chocolate wafer crumbs and press evenly into the bottom and sides of an eight-inch pie pan.
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Stir marshmallows and milk together in a pan over low heat (or microwave).
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Let cool to room temperature.
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While marshmallow mixture is cooling, melt chocolate in top of double boiler (or microwave).
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Stir in coffee and liqueur into the chocolate.
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Pour chocolate into the marshmallow mixture.
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Whip one cup of heavy cream until peaks form.
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Fold into mixture.
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Pour into the crumb crust.
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Refrigerate for two hours.
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Before serving whip the remaining heavy cream and garnish top of pie.