In his second season teaming up with Florida quarterback Steve Spurrier, Casey was again the leading receiver in the SEC with 58 receptions for 809 yards and eight touchdowns.

[10] The Gators coaching staff named him as the recipient of the team's Fergie Ferguson Award, as the "senior football player who displays outstanding leadership, character and courage.

"[3] Casey was selected by the Atlanta Falcons in the sixth round (81st overall pick) of the 1966 NFL draft.

He signed a two-year contract for approximately $125,000, but he was released by the Falcons in August 1966 without appearing in any regular season NFL games.

[11][12] Casey was inducted into the University of Florida Athletic Hall of Fame as a "Gator Great".