SpartanMag has the story and Boisture's full statement, a portion of which is excerpted below:
It is in my best interest that I have decided to leave the Michigan State football program. I love the university, my teammates, the medical staff and most of all Coach Dantonio. [ . . . ] I have the utmost respect for him as a coach and person and wish him and the Spartans nothing but success.
When Boisture committed to MSU in 2009, he was seen as a big-time pickup: both Rivals and Scout rated him as a 4-star recruit. He had an oustanding junior season at Goodrich High School, and moved to Saline for his senior year to face off against stronger competition. Unfortunately, the move backfired: Boisture had, by all accounts, a difficult senior season, and the decision to nonetheless invite him to the prestigious Elite 11 quarterback camp raised eyebrows.
Still, he played decently enough in the spring game, and at 6'6", 215 lbs., he certainly had the size to develop into an outstanding quarterback -- and hopefully he does, wherever he ends up. Good luck, Joe.
Boisture's departure does create a need at quarterback. Next season won't be a problem, as MSU's depth chart at quarterback will be identical to this seasons: Cousins, Maxwell, and Nichol if emergency situations. Connor Cook -- who has earned plenty of plaudits despite being somewhat under the radar -- will arrive in East Lansing this fall and seems likely to redshirt. However, Cousins and Nichol will depart after next season, and leave MSU with only two quarterbacks on the roster. It seems unlikely that MSU will be able to sign another big-time QB for this recruiting class; but look for Dantonio & Co. to sign at least one, possibly two quarterbacks in the Class of 2012.