Well, when you're traded to two teams in one season, it's time to hang it up. He was a damn good pitcher back when he played for the Braves alongside John Smoltz, Steve Avery, and Tom Glavine. With the Cubs... yeah he was still good, but he's been slipping the last couple years but that's what happens with age. I suspect he'll be inducted into the HoF without much rebuttal.