The 6-foot-1, 236-pound senior said the Gamecocks' new offer came as a surprise, because they stopped by Daphne (Ala.) Bayside Academy just one day before the dead period started. Walton committed to Penn State on Dec. 9.
"I just want everybody to know I'm going to do what I feel is right for me," Walton added Thursday.
The linebacker previously said he considered remaining in the South, but his priorities changed when the Nittany Lions showed a lot of interest and were the lone BCS school to offer.
In a Q&A with NittanyNation two weeks ago, Walton said he didn't think he'd commit elsewhere, because he liked the fact PSU wanted him as a Plan-A recruit, while other schools -- such as Ole Miss and Mississippi State -- clearly were looking at him as more of a Plan B. Penn State defensive coordinator Ted Roof offered him early in the summer.
Walton is the third linebacker of Penn State's class, and the staff still is pursuing Wisconsin linebacker commit Garret Dooley. He would be the fifth linebacker of South Carolina's class.