The performer who fell ill at the opening ceremonies of the Alltech FEI World Equestrian Games Saturday night was world-renowned equestrian Eitan Beth-Halachmy.
His condition on Sunday afternoon was listed as critical, according to University of Kentucky Chandler Hospital.
A family spokesperson said he is in intensive care and that more information should be available for fans later on the Web site Caringbridge.org.
Known for his Cowboy Dressage, Beth-Halachmy slumped off his horse, Santa Fe Renegade, as they left the outdoor arena Saturday night. Medical personnel performed CPR as he lay on the ground.
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The spokesperson said the horse is unhurt.
In addition to the opening ceremonies, Beth-Halachmy had been scheduled to teach and perform at the Equine Village later this week.
From his Wolf Creek Ranch in Grass Valley, Calif., Beth-Halachmy raises and trains horses in his Cowboy Dressage school of horsemanship, which combines Western and classical methods.