World's Heaviest Twins: over 723 lb each

Billy Leon McCrary (1946 - 1979) and Benny Loyd McCrary (1946 - 2001), known together as the McGuire twins, were listed in the Guinness Book of World Records as the "World's Heaviest Twins", with 328 kg (723 lb) and 338 kg (745 lb), correspondingly). 

Born in Hendersonville, North Carolina, the twins began using the stage name McGuire and gained popularity as tag-team wrestlers and in carnival stunt shows. Billy McCrary died on July 14, 1979 at the age of 32, following a motorcycle accident during a stunt at Niagara Falls. Benny lived for 21 more years, until his death at age 54 on March 26, 2001 of heart failure.