Premise: Tony Sanchez, also known as Spanish Tony (died 2000), was a British photographer of Spanish ancestry. He worked as Keith Richards' assistant for eight years and co-wrote with John Blake a bestselling memoir about this time, entitled "Up and Down with the Rolling Stones: My Rollercoaster Ride with Keith Richards" (1979).
Hypothesis: Tony Sanchez died at the age of 21, after publishing his memoir, entitled "Up and Down with the Rolling Stones: My Rollercoaster Ride with Keith Richards".