The letter said Sumlin sucked as a head coach, and that he was a n- and could not win.
Sumlin questioned why would send the threatening letter to her home.
A disgruntled fan sent a letter to Kevin Sumlin that included a racial slur.
The Aggies (0-1) play host to Nicholls State (1-0) at 6 p.m. Saturday, and an improved sound system is just one of many changes fans can expect at Kyle Field, Torn said.
Some noted that the letter, which apparently came from an unnamed sender, had as its return address the location of the Houston Country Club.
Sumlin himself noted that the loss was a hard one for fans to digest and added: "I'm not in the business of really paying attention to anything outside this program, or comments good or bad". These words were meant to disrespect Kevin Sumlin as a man and to wound and denigrate his family.
"Did it occur to you that a child may open it?" she tweeted.
Texas A&M president Michael Young and athletics director Scott Woodward announced in a statement the university condemns such "hatred" and they will do everything in their power to ensure the Sumlin family's safety.
"I'm confident we're going to bounce back", A&M receiver Christian Kirk said.
The officials noted that the school is working with local law enforcement to "bring the sender of this letter to justice". Coach Sumlin and his family are part of the Aggie family.
Texas A&M suffered a devastating 45-44 loss Sunday after leading 44-10 late in the third quarter. "We stand with the Sumlins and will not accept this inexcusable act of hate".
No football game, season, program or devastating collapse on national television should be a reason to send any angry letter to a coach's home, much less one as disgusting as this.
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