Sad news indeed. Also, I probably need to read my textbooks again. I always thought once Retinoblastoma was treated in childhood, it was cured. Didn't know it could come back later like that. Gotta be a rare case.

P.S. Just read that he developed Sarcoma in his legs later in life.  That type of tumor spreads to the lungs very readily and was the likely cause of his death, not the Retino.  Unfortunately survivors of childhood cancer are more susceptible to other tumors later on.