Die Already 4 is an action film featured in Grand Theft Auto V.
It is played in the Astro Theaters of Del Perro, Los Santos, during the events of the game circa 2013.
The film is probably a reference to action film franchises such as Die Hard or Lethal Weapon.
In the Freemode Events Update for Grand Theft Auto Online, an Die Already 4 T-Shirt was obtainable if the players logged on GTA Online during September 20th, 2015.
Die Already 4 T-Shirt in GTA Online.