a. alfred taubman , the self-made michigan billionaire died on friday night at his home of a heart attack .
taubman 's business success spanned from real estate and art houses to the hot dog-serving a&w restaurant chain .
waubman was convicted in 2001 of conspiring with the former chairman of christie 's to fix the commissions the auction giants charged at sotheby 's .
taubman was fined $ 7.5 million and spent about a year in a low-security prison in rochester , minnesota , but long insisted he was innocent .