Last February, Brandon John joined more than 100 students outside his Roxbury high school to protest the ouster of his headmaster.
He shivered in the 27-degree temperatures, a small sacrifice for a principal who had just been arrested for credit card fraud but who John nevertheless adored.
“He’s a great person,” said John, then a 17-year-old junior at Madison Park Technical Vocational High School. “He kept me out of trouble.”
On Jan. 9, nearly a year after that protest, John was found shot to death outside a Roslindale house. Full story for BostonGlobe.com subscribers.