Rockstar Games has revealed plans to release a total of four downloadable content packs for Red Dead Redemption on Xbox 360 and PS3 between August and the end of the year. The final pack will introduce a supernatural element to the game with none other than the walking dead: zombies!

Legends and Killers will be the first DLC pack out the game in early August. It will include 9 new multiplayer map locations that double the number currently available; 8 new multiplayer characters including some from Red Dead Revolver; the Tomahawk projectile weapon; and new Achievements/Trophies. It will cost $9.99 on PS3 or 800 Microsoft Points on Xbox 360.

The remaining DLC packs will released in the following order with release dates to be determined.

Liars and Cheats Pack: Attack and Defend multiplayer competitive mode and challenges; new multiplayer horse races, complete with mounted combat; play as the heroes and villains of Red Dead Redemption, as well as 8 additional multiplayer characters; Multiplayer versions of Liars Dice and Poker from the single-player game; Explosive Rifle weapon; Trophies/Achievements. Pricing is the same as Legends and Killers.

Free Roam Pack: Additional Free Roam challenges; new action areas and defensive placements; posse scoring and leaderboards; new anti-griefing measures in Free Roam. Pricing is TBD.

Undead Nightmare Pack: Brand new single-player adventure, challenges and quests; 8 new multiplayer zombie characters; additional animals unleashed in the world; new dynamic events and more. Pricing is the same as Legends and Killers.