Bill was an helicopter pilot responsible for ferrying the Winchester.
History[]
In 2008, Deputy Director Steven Groves, possessed by a demon, after the arrestation of Sam and Dean Winchester, requested that the brothers be transported by helicopter to avoid a possible escape attempt. Bill was the helicopter pilot.
When FBI agent Calvin Reidy went out to see why no was was answering his call, he found that everyone was dead, including Bill. The helicopter then exploded, with Bill's body inside.