The uncle had willed Sullivan a liquor distributorship that he later sold for $5 million, the Atlanta Journal-Constitution reported Thursday.
Sullivan is awaiting trial next spring in the contract slaying of his wife, Lita, in 1987. They were in the midst of a bitter divorce at the time of her death.
Sullivan had inherited Crown Beverages in Macon, Ga., when his uncle, Frank Bienert, died in 1975. Sullivan sold the company in 1983 and bought an oceanfront mansion in Palm Beach.
Bibb County, Ga., prosecutor Howard Simms said he is considering exhuming Bienert's body for an autopsy. Bienert is buried in Boston.
Simms said Fulton County District Attorney Paul Howard, who is prosecuting the contract murder case, told him "there are reasons to have suspicion that foul play was involved in Bienert's death."