Lee played in all 13 games last season, racking up 16 tackles and two pass break-ups. He is expected to compete for a starting position after C.J. Mosley and Adrian Hubbard's departure for the NFL.
"I don't have all of the details at this point and will handle it appropriately once I've had a chance to review all of the information," Alabama coach Nick Saban said in a statement.
Lee was one of two players sent home prior to the 2013 Vizio BCS National Championship in South Florida for violating curfew. He had appeared to have successfully turned the corner before news of his arrest.
"I think Dillon Lee will be a really good player for us," Saban told reporters last month. "I think he has a good understanding of what we want him to do. He runs well. He's got good size and plays good block protection, especially at the line of scrimmage.
"We feel like he can be a very good player and competing for a starting job right now. We're confident that if he wins that job, he'll be able to do an outstanding job for us."