"I've lost a good friend," Bengals president Mike Brown said on Friday morning. "Greg had a good heart. He never lost his interest in quarterbacks and he would come into my office and visit with me and we would talk about prospects. He was a great quarterback. He could do it all. He was mobile, big, strong, accurate. It was the kind of injury that today could have been repaired just like that."

Cook starred at the University of Cincinnati and was taken by the Bengals with the fifth-overall pick in the 1969 draft.

He burst onto the scene, leading the AFL in touchdown passes as a rookie with 15 in only 11 games, adding 1,854 passing yards.

However, a rotator-cuff issue caused him to miss most of the next four seasons, limiting him to one more game, in 1973, before his retirement.