Conversation so far:
What led to William II of England's downfall?
hunting.
What date did he die on?
2 August 1100.
Where did he die?
New Forest.
What killed him?
killed by an arrow.
Where did it hit him?
through the lung.
Who shot him?
shot by an arrow by one of his own men.
What is the other account say?
Later chroniclers added the name of the killer, a nobleman.

Question: What is his name?
Self-contained rewrite: What is the killer of William II of England's name?