(CNN) -- Nothing less than the NFL's reputation is on the line, and possibly the job of the league's commissioner, Roger Goodell. A bombshell video shows Ray Rice knocking out his now-wife on a casino elevator. Another shows him dragging her off. What we don't know for certain is what the NFL knew about the incident and when the league knew it. There are conflicting stories. Critics want answers. Some want Goodell's head. The NFL announced late Wednesday that former FBI Director Robert Mueller will lead an independent inquiry into the league's investigation and how it gathered evidence in the case.
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NEW: ESPN reports sources say Ray Rice admitted punching now-wife in June
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Robert Mueller to lead inquest into how NFL handled its investigation into Rice case
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National Organization for Women says investigation isn't enough
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AP reports NFL executive received a copy of in-elevator video in April
In a memo to NFL owners, the commissioner reiterated that position, saying the @placeholder asked for the videos in February and in May.