The McGuire Twins as immortalized on Family Guy (left) and The Simpsons (right).
Sadly, in 1979 at the age of 32, Billy died of injuries after a mini-bike stunt gone wrong in Niagara Falls on his way to Ripley's iconic Believe It or Not! Museum in Ontario, Canada. In mourning, Benny erected the world's largest granite gravestone, 13 feet wide and weighing three tons, etched with their beloved mini-bikes, on view today in The Cemetery at Crab Creek Baptist Church outside Hendersonville, North Carolina. Benny himself died of heart failure in 2001, at the age of 54.