Add David Kopay to the list of gay NFL players who didn't feel able to come out during their sporting career. Kopay was a running back for several teams during his playing days, starting with the San Francisco 49ers in 1964 and finishing with the Green Bay Packers in 1972. He expected to be offered coaching positions after he retired from the sport, but his sexuality was becoming known and he feels like he was overlooked with that reason. He then chose to come out publicly in 1975.
Embracing his role as an ambassador for gay people in sports, Kopay is on the board of the Gay and Lesbian Athletics Foundation, and is also associated with the Gay Games, for which he served as an announcer in 2006. He's also announced that when he passes away, he'll be leaving $1m as a donation to the Washington Q Center.