The Boston Celtics paid tribute to the late Bill Walton right after securing their spot in the NBA Finals ... with team owner Wyc Grousbeck honoring the NBA great during their post-game celebration.
The Cs finished off the Indiana Pacers with a 105-102 victory in Game 4 on Monday ... and when Grousbeck received the Eastern Conference Finals championship trophy, he acknowledged the tragic loss that was announced hours prior to the matchup.
"All I can think about right now is we lost a great Celtic today," the entrepreneur said during the ceremony.