Kelly, 37, was selected by Ottawa in the third round (No. 94) of the 1999 NHL Draft and spent his first seven seasons with them. He was traded to the Boston Bruins on Feb. 15, 2011 and helped them win the Stanley Cup four months later.
He spent six seasons in Boston before returning to Ottawa for the 2016-17 season, where he had 12 points (five goals, seven assists) in 82 games. He had two assists in 12 games with the Anaheim Ducks last season, and won the bronze medal with Canada at the 2018 PyeongChang Olympics.
He has 291 points (123 goals, 168 assists) in 845 regular-season NHL games, and 32 points (12 goals, 20 assists) in 92 Stanley Cup Playoff games.
The Senators finished 15th in the Eastern Conference last season (28-43-11, 67 points) one season after advancing to Game 7 of the Eastern Conference Final.
