Bill is the main antagonist of the film. He is the founder and leader of The Deadly Viper Assassination Squad, to which The Bride formerly belonged, and also her former lover. Because the code names of the members are all referring to venomous snakes, Bill's code name is Snake Charmer. He and the four remaining Deadly Vipers attempt to kill her after she learns she is carrying Bill's child and leaves him without warning. Some time after the massacre, the squad has disbanded. When Bill finds out The Bride isn't dead but instead in a coma, he sends former Squad member and mistress Elle Driver to the hospital to kill her, but Bill changes his mind and tells Elle to abort the mission, saying that killing a helpless person would demean the name of the Assassination Squad.
When you find this one, you will have finished your quest to kill (find) Bill. It is another camo pill bottle in a bush.