I have Kalitas, Traitor of Ghet in play. We are playing with 3 people. If i beat one player, would the creatures he own die? So i would get 2/2 zombie tokens from his creatures?
According to the Comprehensive Rules (http://media.wizards.com/2017/downloads/MagicCompRules_20170119.txt), this is what happens when a player loses the game:
104.5. If a player loses the game, he or she leaves the game. [...]
800.4a When a player leaves the game, all objects (see rule 109) owned by that player leave the game and any effects which give that player control of any objects or players end. [...]
The definition of the word "die" is:
A creature “dies” if it is put into a graveyard from the battlefield.
Since a losing player's creatures leave the game instead of being put into a graveyard, those creatures are not considered to have died, and Kalitas does not give you any tokens.