Blue, who has a 3.7 grade point average, is 6-foot-3, 225 pounds.
"He's an excellent player," Millbrook coach Clarence Inscore said. "He was our leader on defense and the conference defensive player of the year. He has a combination of excellent size and excellent speed."
Blue was a late addition for Rutgers after the hiring of offensive line coach Mitch Browning, who recruited Blue to Davidson. Initially, Blue was not going to visit Rutgers, but he made the trip for the weekend.
"He felt like Rutgers was the best fit for him," Inscore said. "He's capable of playing at a high level, and with Rutgers moving to the Big Ten, that was a big part of it."
Scout.com recruiting analyst Michael Clark contributed to this report