More and more details are emerging out of the East 2nd Street home of Levi Aron.

On Thursday, they NYPD was parked for most of the day with two crime scene vans in front of the home where the murder and dismemberment of of 8-year-old Leiby Kletzky is alleged to have taken place.

Authorities at one point donned special bio-hazard suits and brought out packages as well as other items from the home to try and further connect 35-year-old Levi Aron to the murder.

Many in this tight-knit community are starting to get a better understanding of the man who lived alone in the family's attic.

For 34 years and 363 days, Aron by all accounts was not a monster. This doesn't necessarily mean he suddenly became one, "They don't develop overnight," said Dr. Michael Stone, a professor of clinical psychiatry at Columbia University.

Dr. Stone has researched more than 700 killers -- including interviewing many in person -- and has worked with the FBI to understand what fuels a killer's rage.

In Aron's case, stone believes the murder of Kletzky may not have been as isolated as it appears, "He may have molested others. He may have tried to befriend others in this kind of pathetic lonely way of this reclusive guy," said Stone.