According to the Associated Press, the NFL in April received a DVD containing the surveillance video of Ray Rice slugging his fiancée, despite Roger Goodell claiming repeatedly that no one in the league had seen it before this week.

From Rob Maaddi at the AP:

A law enforcement official says he sent a video of Ray Rice punching his then-fiancee to an NFL executive three months ago, while league officers have insisted they didn't see the violent images until this week.

The person played The Associated Press a 12-second voicemail from an NFL office number on April 9 confirming the video arrived. A female voice expresses thanks and says: "You're right. It's terrible."
The AP's law-enforcement source says the NFL never followed up after receiving the tape.