Tom O'Brien was a jockey. Many in the racing industry mourn his death at the age of 39 after a diagnosis of cancer. Many publications called him a fantastic person. O'Brien secured victories at the Cheltenham Festival. The Guardian and 7NEWS reported his death after a courageous fight with cancer. At Bangor, a close friend called him a champion and a brilliant rider. Yahoo News Australia said O'Brien was the second jockey to die in two days. Tributes continue throughout the racing community.