A 15-year-old who opened fire on classmates at a Michigan high school, killing four and injuring seven, was charged on Wednesday as an adult with one count of terrorism and four counts of first-degree murder.

The news came shortly after the Oakland County Sheriff’s Office confirmed that a fourth victim, a 17-year-old, had died this morning at McLaren Oakland Hospital in Pontiac, Mich.

“There are facts leading up in the shooting that suggest this was not just an impulsive act,” Oakland County Prosecutor Karen McDonald said. She said “charging this person as an adult is necessary to achieve justice and protect the public. Any other option would put all of us at risk of this person because they could be released and still a threat.”

The four people slain were identified as 17-year-old Justin Shilling, who died Wednesday; 14-year-old Hana St. Juliana; 17-year-old Madisyn Baldwin and 16-year-old Tate Myre, who died in a patrol car Tuesday while sheriff’s deputies were taking him to a hospital.... Read More: Washington Post