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Levi Aron didn't say a word while being sentenced to 40 years to life for kidnapping and killing 8-year-old Leiby Kletzky last year.

Prosecutors said it was one of the most horrific cases in the city's history .

"When everybody prayed that this little boy would be brought home safe and sound, what did Aron do? He made a choice that day," said Assistant District Attorney Julie Rendelman. "He could have let Leiby go, let him live, let him become a man and get married and raise a family, a choice any human being would have made. But that was not his choice."

Leiby got lost while walking home alone for the first time from a religious summer camp. Aron brought the boy to his apartment and kept him overnight. He said he panicked when he realized the community was searching for the boy.

Earlier this month, he pleaded guilty to drugging and smothering him and then cutting his body into pieces.

His lawyers say he's not insane but clearly has mental problems. They say he is remorseful for this horrible crime.

The defense said it is worried other inmates could attack or kill Aron because he killed a child. The judge agreed he should be in protective custody.

"Levi Aron, while incarcerated, must be protected so that his sentence is not transmuted into a death penalty," said Defense Attorney Howard Greenberg.

Aron will be eligible for parole in 40 years. He'll be 75 years old. The Brooklyn DA's office said it will work hard to make sure he is never released from prison.

"There will letters waiting for the parole board, written by myself, my office, the Kletzky family and members of the Brooklyn community reminding the board of the heinous acts in July of 2011," Rendelman said.

"I am confident a group of people sitting on a parole board, looking at the facts in this case, will keep him in prison many years after the 40 years," said Assemblyman Dov Hikind.

Leiby's parents didn't appear in court. But in a written statement, they thanked their supporters and said not a day goes by that they don't think of their little boy.