O'Sullivan played 31 games with Carolina and Minnesota last season, scoring two goals with six assists. The 26-year-old from Winston-Salem, N.C., has 56 goals and 101 assists in parts of six seasons with four teams. He had career highs of 22 goals and 31 assists with the Los Angeles Kings in 2007-08.
O'Sullivan was drafted in the second round by Minnesota in 2003.
For our team, as a group, we've never been this far before, and so it's just more lessons learned, and sometimes you have to go to the school of hard knocks to find out what works and what doesn't. We've got a young group. They've played some unreal hockey here to get us this far, and we showed if we're not going to play the proper way, a really, really good hockey team is going to beat you, and that's what they did. It's a lesson learned.
— Lightning coach Jon Cooper after Rangers win in Game 6 forced a Game 7 that will be played at Madison Square Garden on Friday