Florida attorney Mark O'Mara is being investigated by the state bar for an undisclosed possible violation of ethical rules in connection with his defense of George Zimmerman. What could he have done wrong? A spokeswoman for the Florida Bar confirmed to multiple media outlets that there was an open investigation against O'Mara but declined to offer additional details. A spokesman for O'Mara, who won Zimmerman an acquittal for the murder of Trayvon Martin, told NBC that the lawyer "is unable to comment" on the bar complaint.