William "Bill" Overbeck is one of the four playable Survivors in Left 4 Dead.

Overview: He is a Vietnam veteran who served in the U.S. Army 1st Special Forces Group, and is the oldest of the group. He is usually seen wielding the Assault Rifle (which appears as the M16A2, a real-life assault rifle used by the U.S. Military after the Vietnam War). He often has a lit cigarette in his mouth that only extinguishes when he dies.