New Market, Tennessee – River Glen Horse Trials and the USEA are saddened to report that the 9-year-old Thoroughbred gelding All Aboard ridden and owned by Audrea Dyer collapsed and died on course during the Open Intermediate Division of the River Glen June Horse Trials today. The rider was unhurt. All Aboard will undergo necropsy. Samples were collected and will be analyzed as a part of the ongoing USEA Cardiopulmonary Research Study. Our thoughts are with all of the connections to All Aboard at this difficult time.