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DALLAS (CBSDFW.COM) – Ron Springs and Everson Walls played on opposite sides of the football as teammates with the Dallas Cowboys in the 1980s. But the two men shared a bond beyond the locker room, well after their playing days.

Walls joined Springs in the battle against Type 2 Diabetes by donating one of his kidneys to his friend and former teammate in March 2007. The transplant helped extend Springs’ life.

However, for Walls, this gift was not motivated by generosity. “It was more selfish than heroic,” Walls recently explained. “Everyone wants to call it heroic. It was selfish. That’s my boy. I wanted him around. He made life funnier, just from being in his presence.”

Watch: Everson Walls Remembers Ron Springs

During his nine years with the Cowboys, Walls was known for his knack of stealing the ball away from opposing quarterbacks. But it was the gift to a teammate that stands as an extraordinary moment in team history.