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Remember those promos that Sean O'Haire appeared in and said "I'm not telling you anything that you don't already know"? This was clearly going to be a very interesting character.
Sean O'Haire started his career in WCW, primarily teaming with Chuck Palumbo. When the company was purchased by WWE, his contract was picked up.
In WWE, he came in as part of the "invasion" angle, leading up to Invasion pay-per-view event, where they would lose to the APA. O'Haire and Palumbo only teamed together for about two months in the WWE.
O'Haire was sent back down to Ohio Valley Wrestling for some extra training, and he returned in the early part of 2003 with the aforementioned vignettes.
Soon, he came under the wing of Hall of Famer Rowdy Roddy Piper, and the two really seemed to have something going. O'Haire even got a victory over Rikishi at Backlash 2003. But when Piper was let go from WWE at the time for making some ill-advised comments in an interview on Real Sports with Bryant Gumbel, he was let go, too.
This seemed to be the beginning of the end for O'Haire, who never really got used prominently after that. He was released in April of 2004 and since has spent some time in Japan and also dabbled into mixed martial arts. He's also had some legal problems in recent years (h/t The Sun).
Sean O'Haire had the look and athletic ability to become a major star in WWE. Plus, I really wish they would have pushed that devil's advocate character a little further.