T.J. Lane takes off his shirt to show a white T-shirt with the word "KILLER" spelled out on it at his sentencing. Lane was sentenced to life without parole for killing three students in a shooting rampage at a high school in a small town east of Cleveland.

Dina Parmertor, mother of shooting victim Daniel, speaks during the sentencing of T.J. Lane in Cleveland, Ohio, March 19.

Santa Ana school police Sgt. Kevin Philips locks his rifle in a gun rack mounted in a police vehicle in Santa Ana, Calif., Jan. 24, 2013. The semiautomatic rifles look like they belong in a war zone instead of a suburban public school, but officials in this Los Angeles-area city say the high-powered weapons now in the hands of school police could prevent a massacre.

Santa Ana school police Sgt. Kevin Philips checks out a rifle from the police armory in Santa Ana, Calif., Jan. 24. The officers split their time between 44 schools in the district and keep the rifles in a safe at their assigned school or secured in their patrol car each day before checking the weapon back in to the school police headquarters each night.

Children from Sandy Hook Elementary School make their way to their new school in Monroe, Conn., on Jan. 3.

A bus traveling from Newtown, Conn., to Monroe stops in front of 26 angels along the roadside on the first day of classes for Sandy Hook Elementary School students since the Dec. 14 shooting.

The entrance of the new Sandy Hook Elementary School is guarded by a police road block on the first day of classes since the Dec. 14 attacks.

Firearm instructor Clark Aposhian holds a handgun up as he teaches a concealed-weapons training class to 200 Utah teachers on Dec. 27, in West Valley City, Utah. The Utah Shooting Sports Council said it would waive its $50 fee for concealed-weapons training for Utah teachers.

A Utah teacher is shown how to handle a handgun by instructor Clint Simon (R).

David Burnell, CEO of OPSGEAR, teaches self-defense as part of a concealed weapons training class to 200 Utah teachers on Dec. 27.

Clark Aposhian, President of Utah Shooting Sport Council, holds a pistol during the concealed weapons training.

Tracie Bradford, of Perry Hall, Md., consoles her daughter Leah, a student at Perry Hall High School who says she was in the school's cafeteria when a student was shot there and critically wounded on the first day of classes, Aug. 27, in Perry Hall, Md.

A Baltimore County police officer speaks to a parent as students are evacuated from Perry Hall High School after a student was shot and critically wounded on the first day of classes Aug. 27, in Perry Hall, Md.

Parents and students try to find each other after a student was shot and critically wounded on the first day of classes at Perry Hall High School, Aug. 27, in Perry Hall, Md.

Students leave the gravesite of Chardon High school student Daniel Parmertor after his burial in Chardon, Ohio, March 3. Three students were killed and two others wounded by suspect TJ Lane in Monday's shooting rampage at Chardon High school.

The casket of slain Chardon High School student Daniel Parmertor is carried to his gravesite in Chardon, Ohio, March 3.

People gather outside St. Mary's of Chardon on Feb. 28 for a candlelight vigil remembering the victims of a school shooting in Chardon, Ohio.

Students and those in the community embrace one another as they hold a candlelight vigil at St Mary's of the Assumption Church in Chardon, Ohio on Tuesday night.

Alleged gunman T.J. Lane is escorted out of the Geauga County Courthouse Annex by deputies, Feb. 28, 2012, after his court appearance for shooting and killing three students and wounding two others at Chardon High School in Chardon, Ohio. Another student has died from wounds suffered in Monday's shooting rampage at the Ohio high school, authorities said on Tuesday, as the shaken suburban Cleveland town prepared for a vigil for the teenage victims of the attack.

Students comfort each other as they leave the scene of a shooting at Chardon High School in Chardon, Ohio on Monday, Feb. 27.

S.W.A.T. members leave Chardon High School in Chardon, Ohio on Monday, Feb. 27. A gunman opened fire inside the high school's cafeteria at the start of the school day Monday, wounding five students, officials said. Special Agent Vicki Anderson said Monday the shooter was taken into custody near his car about a half-mile away from the high school. A spokeswoman for the Cleveland Clinic confirmed five students were being treated at two different hospitals.

Students leave with parents from Maple Elementary School after a shooting at Chardon High School on Feb. 27.

Parents wait for news at at Chardon High School early Monday morning, Feb. 27.

An overflying paramilitary police helicopter throws flower petals over the Tasso da Silveira Municipal School in Rio de Janeiro, Brazil, on Wednesday, April 13, where 12 students were killed and another 12 wounded --some of them seriously-- a week ago. A disturbed young Brazilian man on a suicide mission shot dead 10 girls and two boys on Thursday at his former elementary school in Rio de Janeiro.

People pray during a mass on Wednesday held outside the public school where 12 children were killed by a gunman last week in Rio de Janeiro.

Relatives mourn the death of 14-year-old Luiza Paula da Silveira Machado during her funeral at the Jardim da Saudade cemetery in Rio de Janeiro on Friday, April 8.

A relative mourns over the body of 14-year-old Luiza Paula da Silveira Machado during her funeral at the Jardim da Saudade cemetery in Rio de Janeiro on Friday, April 8. Brazilian tradition stipulates that people be buried the day after their death.

A girl studies crosses placed in front of the Tasso da Silveira school in memory of the victims of Thursday's shooting in Rio de Janeiro on Friday.

Friends of a shooting victim attend a funeral at Jardim da Saudade cemetery on Friday.

Two women cry in each other's arms while attending the funerals of the 12 children killed the day before in a shooting spree in Rio de Janeiro. Ten girls and two boys between the ages of 12 and 15 were killed by 23-year-old Wellington Oliveira, who shot and killed himself after being confronted by police.

Relatives mourn after the remains of 13-year-old Laryssa Silva were placed in her tomb at a cemetery in Rio de Janeiro.