Kilgour played for the Buffalo Bandits of the National Lacrosse League for eight seasons, before finishing his playing career with the Rochester Knighthawks and Albany Attack. As a player he won three championships with the Bandits, and is the all-time team leader in penalty minutes and faceoffs. Kilgour's number '43' was retired by the Bandits in March 2001, making him the first player to have his number retired by an NLL team. He was inducted into the National Lacrosse League Hall of Fame in 2007.
Kilgour became head coach of the Washington Power for the 2001 season. He led the Power to the playoffs in each of his two seasons as coach before returning to Buffalo as their head coach after the 2002 season. The Bandits posted a 12-4 record in 2003, and Kilgour was awarded the NLL Coach of the Year Award (later renamed to the Les Bartley Award). The next year, after a mediocre 8-8 regular season, the Bandits caught fire in the postseason, making it to the Championship game for the first time since 1997, but lost the championship game to the Calgary Roughnecks losing 14-11. In 2005 the Bandits would again make it to the Champion's Cup final, this time falling short against Colorado Mammoth 16-9.
Following the 2012 season, Kilgour was fired from his post as general manager of the Bandits, but continued to hold the position of head coach. A season later on June 10, 2013, the Bandits Director of Lacrosse Operations, Scott Loffler, informed Kilgour that he would not be retained as coach for the 2014 season.
Kilgour has more wins than any other coach in NLL history, surpassing Les Bartley's 93 wins on March 12, 2010 with the Buffalo Bandits defeating the Toronto Rock 11-10 in overtime at Toronto's Air Canada Centre.
|NLL Coach of the Year Award
- "Bandits Retiring Rich Kilgours' Number 16". Buffalo Bandits. 29 March 2011.
- "NLL Inducts Second Class to Hall of Fame". NLL.com. February 16, 2007. Retrieved 2007-02-18.
- "Bandits moving on without Kilgour". NLL.com. June 10, 2013. Retrieved June 11, 2013.
- "New indoor lacrosse team to play in Salamanca". Salmanca Press. 5 June 2014.