Bill L4D

William "Bill" Overbeck is one of the four playable Survivors in Left 4 Dead. He is a Vietnam veteran who served in the US Army 1st Special Forces Group, and is also noticeably the oldest of the group. In official media, he is usually seen wielding the Assault Rifle, probably to complement his back story. He often has a lit cigarette in his mouth that only extinguishes when he dies.

Bill is killed prior to the events of Left 4 Dead 2's The Passing during the (canonical) events of The Sacrifice. In the latter he sacrificed himself to raise the bridge for the other three Survivors. According to The Sacrifice comic, Bill died after being attacked by multiple Tanks when he went down to reactivate the lift bridge at the finale so the rest of his team of Survivors may be safe from the oncoming horde.