This file photo taken on May 02, 2014 shows US rider Nicky Hayden during the first MotoGP free practice of the Spanish Grand Prix at the Jerez racetrack in Jerez de la Frontera on May 2, 2014. Former world motorcycling champion Nicky Hayden died on May 22, 2017 announced the Bufalini di Cesena hospital. Hayden was in "extremely critical" condition following a serious bicycle accident which left him with brain damage. Pic/AFP

American World Superbike rider Nicky Hayden, hit by a car in a bicycle accident in Italy last week, has died of his injuries, the Italian hospital where he was treated said Monday. Hayden, 35, who won the 2006 MotoGP world title, suffered severe chest and head injuries in the accident, which happened while he was training on his bicycle in central Italy, south of the seaside resort of Rimini.