[2] While at Virginia, Kirby was a teammate of Ronde Barber, who he later played with as a Tampa Bay Buccaneer.
[3] Kirby signed with the Indianapolis Colts on April 24, 1998,[4] though he spent the whole 1998 season on the injured reserve list due to an Achilles injury.
[3] He was promoted to the active roster on November 9[5] and played six games with the team in 2000, two of which he started.
[4] Kirby signed a two-year contract with the Chicago Bears on April 29, 2002, but he was released on July 15.
[4] In 2010, Kirby pledged to donate his brain and spinal cord tissue to the Center for the Study of Traumatic Encephalopathy at the Boston University School of Medicine.