William Gay was selected by the Pittsburgh Steelers in the fifth round in the 2007 NFL draft. In his first preseason game, he intercepted a Tyler Palko pass and tackled Saints’ first-round draft pick Robert Meachem. In his rookie year he played in sixteen games, recording nineteen tackles. In his second year, he saw more significant playing time. Gay also contributes on special teams. After the loss of Bryant McFadden in 2009, Gay assumed the starting duties at cornerback for the 2009 season opposite Ike Taylor. He has been resigned for the 2010 season.