Kelly played with the Senators from 2003-2011. He was dealt to the Boston Bruins in a midseason trade that season for a 2nd round pick in 2011 that ended up being Shane Prince.
Prince was traded to the New York Islanders last season after playing in 42 career games for the Senators and scoring 13 points.
The Senators are now getting a second tenure with Kelly. The forward won a Stanley Cup with the Boston Bruins the first season he was there in 2011, and the Senators are hoping that his veteran leadership can help elevate a talented team to the next level.