Kurt Caselli, a 30-year-old superstar in the dirtbike-racing world, died yesterday while competing in the Baja 1000. Early reports indicated he struck a manmade booby trap, but ESPN is saying those reports were "discredited." The extremely competitive yet fun-loving racer leaves behind a beautiful fiancee, to whom he proposed just three months ago. Click through for a collection of photos — some action-packed, some funny and some heartbreaking — from Caselli's life and career. RIP.