These tragedies were met with initial shock and grief, and drew television cameras and news headlines. But the trauma lingered in the days, weeks and months that followed, altering habits, moods and relationships and leaving schools across the city reeling.
"It’s hard having to hold back tears for kids," said the principal at a school where a student was killed last month, "and also letting students know that it’s OK to cry, it’s OK to grieve."