Angel Nieto, 13-time world motorbike world champion, dies at 70

MADRID -- Former motorbike world champion Angel Nieto has died after suffering a head injury in a quad bike accident last week. He was 70.

His son, Galete Nieto, confirmed Thursday that his father had died in comments shown on Spanish national television.

"We are all sad. He was a great father, a great friend, and a very good athlete," Galete Nieto said.

Angel Nieto was being treated in the Policlinica Nuestra Senora del Rosario hospital on the Spanish island of Ibiza. Earlier in the day, the hospital had said he was in "very critical condition."

Nieto, who was injured while riding a quad bike on July 26, won 13 world motorbike championships between 1969 and 1984.

Spain's King VI and Spanish Prime Minister Mariano Rajoy shared their condolences on social media, while several riders joined in the outpouring of grief.

Marc Marquez, the current MotoGP champion, also tweeted his condolences.

"Thanks for all you have taught us! Rest in peace maestro!" Marquez posted.