"He was the fastest man in football," Steffy said. "He was a great athlete, believe me."
Davis visited West Point for the final time in October to be inducted into Army's Sports Hall of Fame.
Besides his son, Davis is survived by his third wife, Yvonne Ameche Davis, and stepson John S. Slack III from his second marriage. Davis' first marriage to Oscar-nominated actress Terry Moore ended in divorce after 14 months.
Davis met Yvonne at the 1996 Heisman dinner. She was previously married to 1954 Heisman winner Alan Ameche of Wisconsin.
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