The Ottawa Senators announced on Monday that Bryan Murray was recently diagnosed with cancer.
In a statement, the club said that its president of hockey operations and general manager will begin treatment for the condition immediately.
"Mr. Murray's treatment schedule may require him to be away from the Senators office periodically," read the statement.
"During his periodic absence, assistant general managers Pierre Dorion and Randy Lee will be responsible for managing the Ottawa Senators hockey operations department."
Murray, 71, has been with the Senators since the 2003-04 season, first as a head coach before replacing the fired John Muckler as GM in 2007. He was behind the bench for Ottawa's run to the Stanley Cup final in the 2006-07 season.
He has also served as coach or general manager in Washington, Detroit, Florida and Anaheim. He won the Jack Adams award as coach of the year with Washington in 1984 and was general manager of the Florida team that advanced to the 1996 Cup final.