Everyone here ruled out because no "U R Black Sark. LEAVE."http://www.espn.com/college-footbal...in-texas-aggies-receiving-hate-mail-says-wife
I think he either he wrote it himself, or his wife did it, or a supporter did it to shift the focus away from the fact that he blew a game that was in the bag.
His wife is a fairly unattractive white woman.
It was written by a woman, and most definitely not a doctor.