Canberra track work rider Riharna Thomson dies following freak accident March 3, 2017 ACT, ARCC, horse, NSW, racing, Canberra, Jockey, Colin Watts, Riharna ThomsonCANBERRA TIMES: Canberra track work rider Riharna Thomson died on Friday morning following serious head injuries sustained from an accident at Thoroughbred Park on Tuesday.