"Heavyweights" actor Joseph Wayne Miller, who played Salami Sam in the '90s hit has died ... TMZ has learned.
Miller's mother, Patricia, tells us her son died in his sleep Tuesday in Chicago. We're told his girlfriend found his body. So far the cause of death is unknown ... but Patricia says he suffered from sleep apnea.
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Joe's character, Salami Sam, was one of the campers at Camp Hope ... a weight loss camp for kids.