OU & the NCAA found out at the same time but the NCAA did nothing until OU completed their own investigation.
I have no idea who read their email first if it was an OU guy or a NCAA guy & the NCAA called up the OU guy & said "hey, did you read that?" or if OU contacted the NCAA saying "hey, we're looking into that!"
It really doesn't matter much either way because the NCAA did nothing until OU investigated the matter & they were waiting on the results of OU's investigation, much like they did w/ the whole 'AD is trying around a brand new Lexus from a used car dealer that doesn't even sell new cars'.
The NCAA receives hundreds of "tips" per day & generally does nothing about them but will make it known if it's serious in nature to the University that something is being tossed around about their program.
Horn fans would like to believe that the NCAA just got a tip & set up camp in Norman & that's just not true.
What is true is that both the NCAA & OU received an email the same day concerning players being paid for work not performed.
OU investigated the matter & found out it was true & sent the results to the NCAA. Then & only then did the NCAA get serious about the whole deal because OU turned themselves in.
March 3, 2006: OU and the NCAA enforcement staff receive an anonymous e-mail alleging the players' misconduct. This prompts a university investigation.
Aug. 21, 2006: OU acknowledges the violations in its preliminary report to the NCAA enforcement staff.
Sept. 20, 2006: The enforcement staff sends OU a notice of inquiry.
Feb. 9, 2007: The enforcement staff sends OU a notice of allegations, in which OU is notified it will go before the NCAA Committee on Infractions April 14.
March 8, 2007: The enforcement staff receives OU's response to the notice of allegations.
March 20, 2007: OU and the enforcement staff conduct a prehearing conference.
April 14, 2007: OU and the enforcement staff present their respective cases at a hearing before the NCAA Committee on Infractions.
July 11, 2007: The NCAA announces its sanctions on OU, extending the probation for two years, stripping away two additional scholarships and forcing them to vacate all wins during the 2005 season.
February 22, 2008: OU wins appeal of vacated wins.