On 8 September 2006, Brock was driving in the "Targa West '06" rally. He was at the second stage of the race in Gidgegannup, Western Australia. He was three kilometres off the finish of the second stage when his car skid off a downhill left-hand bend. Brock died on the spot. He was 61. The co-driver, Mick Hone, was taken to hospital and survived.