O'mara is not a divorce attorney. It is not suspicious at all that he wouldn't be george's lawyer for that. O'mara DID show up at the scene though, but that's probably because they were making up lies on the news about him waiving a gun, practically making it out like he was taking hostages. So O'mara was there because had any of that been true, that would have been O'mara's expertise, and to see exactly what was REALLY going on just in case the lies get out of control.