In a large bowl, stir together the cherry pie filling, drained pineapple, and sweetened condensed milk until just combined.

Gently fold in the whipped topping and mini marshmallows. Mix just enough so everything is evenly combined and fluffy.

Spoon the mixture into the graham cracker crust. Spread it out evenly and smooth the top.

Cover the pie and place it in the fridge for at least 2 hours, or until firm.

Once chilled, slice and enjoy straight from the fridge!