Kennedy retired following the World Series on Wednesday, Bob Nightengale of USA Today reports.
Kennedy ended the season on the injured list with a shoulder injury, and he opted to retire immediately after winning his first World Series with the Rangers. He pitched in 17 seasons at the big-league level and had strong runs of success as a starter as a member of the Diamondbacks, Padres and Royals before shifting to the bullpen later in his career.