That announcement drew a big cheer from the assembled crowd at St. Paul's. "Auburn is the best fit for me," Williams said.
Prior to announcing he was headed to Auburn, the linebacker said, "First of all I would like to thank God for giving me the ability to play football and have this option to pick a school. All colleges who gave me offers are really great colleges and I am not putting anybody down.
"I would like to give thanks to my family and friends, especially my mom and my uncle who supported me all of the way from Eight Mile to now," he said.
"This has just been a great, exciting process," he added. "Recruiting is great and I know I was supposed to make the decision at the Under Armour Game, but I decided to go ahead and enjoy my senior year so I am going to go ahead and make my decision today."
St. Paul's head coach, Steve Mask, introduced Williams and said, "Obviously we are very excited. What has transpired today couldn't have to a more deserving young man."
Williams, who is six-foot-two, 226 pounds, chose Auburn over Alabama at his announcement ceremony at his high school before hitting the field for spring practice session. He also had Florida, Alabama and the USC Trojans on his list of finalists.
Williams noted that his first scholarship offer came as a ninth grader from Dameyune Craig, Auburn's co-offensive coordinator who was an assistant coach at Florida State when he made the offer to Williams.
"When he went to Auburn it made it even better," Williams said. "I kind of liked Auburn and at the time and it was a battle between Auburn and Alabama. Me and Coach Craig talked nearly every week. We talked more than about football. We talked about personal life, family and stuff like that.
"Of course, Alabama is a great school and they have their tradition. Coach (Nick) Saban, he is a really great coach and all, and I talked to Coach Smart (Alabama assistant Kirby Smart), but I still think Auburn is the best fit for me."
Williams said that he got excited about an offer from Southern Cal and being recruited by USC assistant coach Tee Martin, but eliminated the Trojans. "Me and my family talked about it last week and USC is really a long way," he said. "I want to play close to home."
The linebacker, a star performer dating back to his sophomore season with the Saints, has been invited to participate in the 2014 Under Armour All-American Game along with his teammate, offensive lineman Josh Casher, who has committed to the Tigers as a center.
Williams attended a junior day at Auburn in February along with Casher and another Mobile area high school star, Vigor High linebacker DeShaun Davis, who is also a recent commitment to the Tigers.
Tre Williams makes tackles from sideline to sideline for St. Paul's.
Rated the No. 3 middle linebacker prospect in the country by Scout.com, Williams is also a standout on the St. Paul's track and field team. The linebacker won the Class 5A state shot put championship last week, edging Casher for the title.
A versatile athlete who has played linebacker, safety and tight end for Saint Paul's, Williams is the fifth current high school junior who is committed to sign with the Tigers in the 2014 class.
(More to come.)