Considering it's being propagated as a "school shooting", this one is the most absurd...
St. Johns, MI
Elementary School
Attempted or completed suicide, with no intent to injure other person
A 31-year-old man pulled into the parking lot of East Olive Elementary School and called 911, saying he was suicidal and had a handgun. For several hours a negotiator, dispatched to the scene, spoke with the man, who was a military veteran with PTSD. But the man shot himself and died from his injuries. The school was closed at the time.