(AP Photo/Mark Duncan)
The teenager under arrest in Monday's attack, T.J. Lane, faced an afternoon hearing in juvenile court.
Shaken residents offered condolences and prayers to the families of those killed and wounded at 1,100-student Chardon High School in suburban Cleveland. All three of the dead were students.
"This gets more tragic, the whole area is suffering, our prayers go up to God to give all strength, healing and closure," said one of hundreds of Facebook postings on a memorial page.
Meanwhile, the community offered grief counseling to students, staff and others at area schools.
"We're not just any old place, Chardon," Chardon School Superintendent Joseph Bergant II said. "This is every place. As you've seen in the past, this can happen anywhere, proof of what we had yesterday."
A Cleveland hospital said Demetrius Hewlin, who had been in critical condition, died Tuesday morning. That news came shortly after Police Chief Tim McKenna said 17-year-old Russell King Jr. had died.
Another student, Daniel Parmertor, died hours after the shooting, which sent students screaming through the halls and led teachers to lock down their classrooms as they had practiced doing so many times during drills.
Both King and Parmertor were students at the nearby Auburn Career Center, a vocational school, and were waiting for a bus for their daily 15-minute ride when they were shot.
The police chief would shed no light on a motive.
"I feel sorry not only for that family but all the families that are affected by this," McKenna said. Characterizing himself as a "hometown boy," he added: "Chardon will take care of Chardon."
A student who saw the attack up close said it appeared that the gunman targeted a group of students sitting together and that the one who was killed was gunned down while trying to duck under the cafeteria table.
Lane's family is mourning "this terrible loss for their community," attorney Robert Farnacci said in a statement.
Lane did not go to Chardon High, instead attending nearby Lake Academy, which is for students with academic or behavioral problems.
Fifteen-year-old Danny Komertz, who witnessed the shooting, said Lane was known as an outcast who had apparently been bullied. But others disputed that.
"Even though he was quiet, he still had friends," said Tyler Lillash, 16. "He was not bullied."
Farinacci, representing Lane and his family, told WKYC-TV that Lane "pretty much sticks to himself but does have some friends and has never been in trouble over anything that we know about."
Long before official word came of the attack, parents learned of the bloodshed from students via text message and cellphone and thronged the streets around the school, anxiously awaiting word on their children.
AP writers Dan Sewell in Cincinnati and Julie Carr Smyth and Andrew Welsh-Huggins in Columbus contributed to this report.