Fisher, 52, had hoped to wait to announce his decision until after Saturday's regular-season finale, which the Seminoles (5-6, 3-5 ACC) need to win to extend their streak of 35 consecutive bowl games.
On Friday, Fisher handed in his resignation to Florida State officials. He is the first coach since Johnny Majors left Pitt for Tennessee back in 1977 to leave a school he won a national championship at for another school.
Fisher's buyout from Florida State is the sum remaining on the contracts of his assistants who are not retained, which would be in the range of $7 million.
"You know our team has a lot of potentials and he's just kind of giving up because of some easy money and a lot of pressure", said FSU student Will Singleton. "I wish him the very best".
In the interim, I have appointed associate head coach and defensive tackles coach Odell Haggins to serve as our head coach versus ULM.
"Florida State is Florida State".
"I never comment on jobs", Fisher told the Jeff Cameron Show.
Texas A&M has invested heavily in facilities the past five years, including a football operations center.
Jimbo Fisher is leaving Florida State for Texas A&M, four years after leading the Seminoles to their third national title. They'll hire a great coach. "I've been waiting to come to this school and it's like really upsetting". I don't have any doubt about that.
Per a person in Fisher's final meeting with his players, the former head coach apologized for misleading his team.
Information from ESPN's Mark Schlabach and Sam Khan Jr. and The Associated Press was used in this report.