In a small bowl, combine ⅓ cup water and Splenda Sweetener; stir until dissolved. Sprinkle gelatin over the top and let stand for 1 minute.
Bring the remaining ⅓ cup of water to a boil and pour over the top of the gelatin mixture. Stir until dissolved.
Whisk raspberry jam into gelatin mixture until blended. Place bowl into a larger bowl filled with ice water bath and stir constantly until mixture begins to thicken.
Pour over berries, gently tossing to coat.
Transfer filling to prepared crust and refrigerate until set, about 1 hour.