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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.

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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.

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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

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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.