Ken Daneyko played his entire career (1983–2003) with the New Jersey Devils of the National Hockey League, winning three Stanley Cup championships with the team. He has been affectionately nicknamed "Mr. Devil" by Devils fans, as he retired holding the franchise record for games played as a Devil with 1,283 games. 

The Devils retired his uniform number, #3, on March 24, 2006. He was the second Devil to receive the honor after Scott Stevens had his #4 retired on February 3, 2006.

After retirement, Daneyko has worked as a commentator between periods at Devils games for the sports network MSG Plus.