"Coach [Gus] Malzahn recruiting me from day one that speaks volumes to me," Williams said. "If the head coach is recruiting you that says a lot."
"Andrew is a guy we feel like can give us depth early on," Malzahn said.
Joining Williams at Auburn will be teammate Josh Shockley, a preferred walk-on by the program.
Other Chargers who signed were Beau Beasley (Point), Bryson Durden (preferred walk-on at Tennessee), Dalton Etheridge (Jacksonville State) and Jamal Tookes (Army).
One of the other big confirmed commitments in Henry County was Stockbridge's Kendarius Webster, who followed through with his early decision to attend Mississippi.
"They shot me straight every time I had something to ask," the cornerback said. "They pretty much opened their arms and welcomed me in like family. They kept it real with me from the jump and I really appreciated that."
Other Tigers who will play on the next level are Maetron Thomas (Charlotte), Javon Brandon (Tennessee State), Anthron Brocks (Hampdon-Sydney), Malik Bryan (Edward Waters), Mike Pritchett (Clark-Atlanta), Rod Carson (Edward Waters), Ta'Varis Odom (Miles College), Timarcus Cullins (Albany State), Cam Gordon (Miles College) and Antonio Mallard (CAU).
"These are my boys," Webster said. "We've been playing pretty much since middle school. They are like my brothers. I'm going to miss playing with them."