Updated at 2:16 p.m. ET
(CBS/AP) CHARDON, Ohio - The deadline to file charges in a fatal high school shooting loomed as students still reeling from the slaying of three teenagers marched by the hundreds to their reopened school Thursday.
The students, many with their parents and wearing the school colors of red and black, started the day gathered around a courthouse square gazebo, quietly singing the alma mater.
Students hugged the parents and one another they left the gazebo, which was decorated with a growing memorial of red roses and carnations, stuffed animals, burned-down candles and handwritten messages of support.
Six hand-drawn angels graced a plastic-covered piece of cardboard with the wish "May God Bless everybody in Chardon." Two bunches of black and white balloons tied to the gazebo railing included red heart-shaped balloons bearing the names of two victims, and a heart cut from red felt read "ONE HEARTBEAT" and urged people to pray for the town.
"I'm just scared for everybody and I don't know how everybody is going to act going back into school," said Theodore Rosch, 16, a freshman, as his father, Will Rosch, wrapped his left arm around his son's shoulders.
A judge said prosecutors had until Thursday to file charges against the shooting suspect, TJ Lane, a thin, quiet 17-year-old accused of opening fire on a group of students sitting at a cafeteria table at 1,100-student Chardon High School on Monday. Three students died, and two were seriously wounded.
A prosecutor has said Lane, who is in custody, will probably be charged with three counts of aggravated murder and other offenses. Prosecutors are expected to ask that he be tried as an adult.
Records from Lane's juvenile court files show that in 2009 he was, John Breuning, CBS News correspondent Michelle Miller reports. Authorities said "TJ also jumped on John ... put him in a choke hold."
Other court documents show a troubled family life. His father, Thomas J. Lane Jr., was charged with domestic violence, assault, kidnapping and theft and served time in jail. And mother Sarah A. Nolan was charged with domestic violence in 1995 and convicted of disorderly conduct.
Earlier this week, CBS News learned that Lane told police he stole the .22-caliber pistol used in the rampage from his uncle. But now a report has surfaced that he may have taken it from his grandfather's house, where the teenager lived.
In the case involving Breuning, Lane's uncle had come by the house where Lane was living with his grandparents on Dec. 9, 2009, after Lane said he didn't want to go to a volunteer job required for school, according to the sheriff's office report.
The uncle planned to remove Lane's brother, a drug addict, in hopes of preventing further problems, but the brother didn't want to go and punched the uncle after he tried to grab his coat, the report said.
Lane jumped on his uncle and tried to put him in a "choke hold" while his brother grabbed their uncle's legs, the report said. "TJ stated that he was helping his brother out because he assumed John was hurting Adam," the report said.
Lane entered the juvenile court equivalent of a guilty plea to a reduced misdemeanor charge of disorderly conduct and was given a suspended sentence of up to 30 days in jail.
Judge Timothy Grendell wouldn't say if there are other files on Lane that might be covered by a law allowing certain records to be withheld.
Longtime neighbors and friends on Wednesday expressed disbelief at how Lane could be the suspect, describing a boy from a broken family who had struggled in school but appeared to improve once he began staying with his grandparents and attending an alternative school with several dozen students.
"He went from flunking out, from what I understand, to almost a straight-A student with honors, and he was going to graduate a year early," said Russ Miller, who has known Lane for more than a decade and lives near Jack Nolan, Lane's grandfather. Nolan has familial custody of the teenager.
Miller, a Vietnam veteran, said he had talked to Lane about joining the military, but the boy hadn't made plans.
"He was a typical 17-year-old," Miller said. "He didn't really know what he wanted to do in his life." He said Lane didn't smoke, drink or do drugs and is "kind of a health nut."
Another neighbor said Lane played outside often with his sister, building snow hills and skateboarding.
Steve Sawczak, a pastor who has worked with troubled children and lives next to the Nolans, said he never saw hints of trouble from Lane. He said the grandparents gave Lane a healthy place to live and have been left shocked and devastated.
Neighbors said Lane's father visited his son often, sometimes taking him and his sister camping or to the school to catch the bus.