NEW YORK (CBS 2) -- It's been a working weekend for the Brooklyn district attorney's office, which is trying to make sure the case is air-tight against Leiby Kletzky's alleged killer, Levi Aron.
CBS 2's Pablo Guzman has some new insight into the past of the man accused of taking the 9-year-old boy's life.
"We're gathering as much forensic evidence as we can," Brooklyn District Attorney Charles Hynes said.
DA Hynes said that the evidence that was being taken from Levi Aron's house will be part of the murder indictment against him, which will be unsealed this week.
"We will ask for the main charge of felony murder, based on the kidnapping, which is murder in the first degree," Hynes said.
Four days after Aron was arrested, police were still using the house as an active crime scene Sunday – still taking evidence out of the house and loading it onto their truck.
Parents walked past police barricades with children on the street, right past where young Kletzky was killed, police said, in Aron's apartment.
Yosef Moskowitz, who still lives on the block, grew up with Aron.
"I knew him. I used to play board games with him, softball," Moskowitz said. "He seemed to me to be very normal then."
When the childhood friends reunited after having gone separate ways, Moskowitz said Aron was different – and now, police say, he committed this heinous crime.
"Well, obviously he needed help, he really needed psychiatric help," Moskowitz said. "Somewhere along the line, the people, maybe the family, missed it."
On Saturday night the boy's father, Nachman Kletzky, returned the torah that had been lent to the family for the Sabbath.
Yosroel Friedman, a friend of Nachman Kletzky, offered his support.
"The only words of comfort that we can give is, basically, God should comfort him," Friedman said. "God should give him relief."
Friedman was one of the volunteers searching for Lieby, and he said during those times he had hope. Now, he said, he still cries.
At indictment in the case was expected to be handed up early this week.
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