Can you kill all three protagonists in gta v?

The single‑player story of Grand Theft Auto V follows three protagonists—Michael De Santa, Franklin Clinton, and Trevor Philips—who together plan heists and navigate the criminal underworld of San Andreas. The provided source describes the game’s setting, characters, and general gameplay, but it does not mention any mechanic or narrative option that allows the player to kill all three protagonists. Consequently, based on the evidence available, it is not possible to confirm that such an action is possible within the game.