Historical Rules · 29 September 2017
Rule 807.4c
Official source text from the 29 September 2017 Rules release
After a player ends his or her turn, that player passes the turn marker to the player on his or her left. If a player with a turn marker leaves the game during his or her turn, the player to his or her left takes the turn marker after that turn ends. If a player with a turn marker leaves the game before his or her turn begins, the player to his or her left takes the turn marker immediately.