The 6-foot-2, 190-pound Carter, who spent the last season as a post-graduate at Brewster Academy in (Wolfeboro, N.H.), called Scarlet Knights coach Mike Rice about an hour ago and gave him a non-binding oral commitment.
Carter plans to sign his binding national letter of intent next week and could enroll in classes as early as May 31.
"It came down to I can play right away, how comfortable I am with coach Rice and really there's nothing like playing in your home state," said Carter, who was recruited to Robert Morris when Rice as the coach there. "We had a laugh about that. He said if I would have come there, he probably would have stayed at Robert Morris."
Carter grew up in Paramus but his family moved to Willingboro recently, and being able to play in front of his friends and family was important, especially spending a year away from home at Brewster Academy.
When Carter phoned Rice to give him the news of his commitment, it he quickly learned about the coaching staff's excitement.
"(Rice) was real happy when I told him," Carter said. "He was yelling and stuff like that. He was happy. I just felt like that was the spot for me. I think I fit in really well."
Carter was known as a scorer and facilitator of offense at St. Anthony, but developed his defensive game markedly while at Brewster Academy.
The Scarlet Knights needed to fill a slot on the roster because wing Michael Taylor of Boys and Girls (Brooklyn) ran into academic trouble and is heading to prep school for a year.
"I think it's going to work out good," Carter said. "I'm going to play my hardest every day, work hard every day, train hard and get ready for the season."