[2] This 1967 season would be cut short after only four games, however, when he suffered a fractured ankle in a Saturday afternoon contest against the team that drafted him, the Cleveland Browns.

[4] The 1968 season would be O'Brien's final year in the league, during which he would assume his customary role as the team's starting right tackle.

[2] Already moving his attention to the restaurant business during his playing days, O'Brien decided to call it a career at age 32 and retired prior to Steelers training camp for the 1969 season.

[6] After retiring from football, O'Brien owned and operated restaurants in Washington, D. C., Annapolis, Maryland, and Rehoboth Beach, Delaware.

[1] His first restaurant, opened on Wisconsin Avenue in Washington, was called "The Goal Post" and gained popularity with politicians and lobbyists.