Pecan Praline Fudge

1/2 ounce praline liqueur
1 cup pecans, chopped
1/4 pound butter
1 1/2 cups granulated sugar
5 ounces evaporated milk
1 (12 ounce) package Hershey's semisweet chocolate chips
1 tablespoon vanilla extract
1 (7 ounce) jar Marshmallow Cr