John Andretti, nephew of Mario Andretti, has died at age 56 after a long battle with colon cancer. The son of Mario's brother Aldo, and cousin to Mario's sons Michael and Jeff, John Andretti won races in IndyCar, Nascar and other racing circuits. I can recall one Indy 500 where Mario, Michael, Jeff and John were all part of the 33 car racing field. R.I.P.