On Friday, George St-Pierre joined a short list of fighters that have relinquished their UFC titles. Fighters have been stripped of their belts, like Josh Barnett , B.J. Penn , Randy Couture and Frank Mir , but only Frank Shamrock and now St-Pierre voluntarily vacated their titles while champion. The difference between Shamrock and St-Pierre is Shamrock gave up his title to retire, at least temporarily, and he never returned to compete in the organization. St-Pierre stopped short of announcing a retirement and left the door open for a future return
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UFC President Dana White Confident That Georges St-Pierre Will Return – MMA Weekly