Charlene Sumlin tweeted out a picture of the letter Thursday afternoon.
In the letter, the unknown sender wrote: "You suck as a coach! You're a n----- and can't win! Please get lost! Or else."
The letter contained a return address that corresponds to Houston Country Club in Houston, ESPN reported.
Texas A&M President Michael Young and Director of Athletics Scott Woodward released the following statement:
"Earlier this evening, we became aware of a letter of unknown origin that was sent to the Sumlin family home. We unequivocally condemn this disgusting and threatening letter. There is no excuse for hatred and, as a community, we will not allow the ignorance of some to intimidate any member of our community. On behalf of all Aggies, our thoughts are with Coach Sumlin and his family, and we will do all that we can to ensure their safety. We are working with law enforcement authorities to bring the sender of this letter to justice. We stand with the Sumlins and will not accept this inexcusable act of hate."
The Aggies are coming off a season-opening loss to UCLA, in which the team blew a 34-point lead.
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