T. Denny Sanford cause of death: First Premier Bank owner and SD’s richest with $2.1 billion net worth dies at 90: T. Denny Sanford, South Dakota’s richest and First Premier Bank owner, has died at 90. Gov. Larry Rhoden praised his legacy. A cause of death was not announced. #TDennySanford #SouthDakota #FirstPremierBank #BusinessNews #Wealth

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