The U.S. Equestrian Federation (USEF) has paid tribute to 15-year-old Hannah Serfass, who tragically died in a competition in Venice, Florida, on Sunday. Serfass was described as a passionate and talented up-and-coming equestrian, and the USEF, USHJA, and Fox Lea Farm team have expressed their condolences to her family, support team, and friends.