"This is a sad day," Hall of Famer Yogi Berra said. "Johnny was a good friend and a great teammate. He was proud of being a Yankee and always fun to be around. We'll miss him."
Blanchard was among the fan favorites at the Yankees' fantasy camps, held twice a year at the team's spring training complex.
"Johnny was a funny guy and a great storyteller," former Yankees pitcher Bob Turley said. "He was always happy. Everybody loved him and loved being around him."
Blanchard was signed by the Yankees in 1951 and made his major league debut four years later at 22. He is one of four players in Yankees history to homer in four consecutive at-bats, accomplishing the feat over three games from July 21-26, 1961.
"He would do anything it took to help win a ballgame," said Ralph Houk, who managed the Yankees from 1961-63. "Johnny was a true Yankee, there's no doubt about that."