Sara L. "Sally" Buck, 83, who joined the Phillies' limited partnership that formed in 1981, died on Saturday morning.
Before Saturday's game at Citizens Bank Park against the St. Louis Cardinals, there was a moment of silence for Mrs. Buck.
"Sally was loved by many in the Phillies organization from front-office staff, to players, to fellow owners," team president David Montgomery said in a statement. "Her passing leaves the club with a profound sense of loss."
Mrs. Buck and her late husband, Alexander "Whip" Buck, became part of the Phillies ownership group in December 1981. According to the Phillies, none of the longtime partners owns as much of 50 percent of the partnership.