From the Gwinnett Daily Post:
Dr. James Andrews performed reconstructive elbow surgery on the right-hander late last week and Parr will be sidelined until at least the middle of next season.
Parr was removed from the 40-man roster in mid-May to make room for Brent Clevlen, and I guess now we know why. While Parr wasn't that much of a prospect, he was still a pitcher who showed some ability to pitch in the big leagues. I expect to see him join the Royals rotation in a few years, and I wish him the best in his rehab.