The former NFL defensive lineman and Police Academy actor was found by his caretaker on Wednesday afternoon, reports The Los Angeles Times.
While a cause of death was not apparent, Smith is believed to have died of natural causes.
No signs of foul play were detected and an autopsy is due to be performed later this week, according to the LA County Coroner's Office.
Smith's long career in professional football included stints with the Baltimore Colts, Oakland Raiders and Houston Oilers.
He later went on to pursue a career in film and TV, with roles in Family Matters, Sabrina the Teenage Witch, Half Nelson and the first six Police Academy films.
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