Leiby Kletzky, the 8-year-old missing Brooklyn boy, was found brutally killed and dismembered on Wednesday morning. His chopped-up remains were found in the murderer's refrigerator and a nearby dumper. The murderer has already pleaded guilty of killing.

Kletzky disappeared on Monday, when he was on the way to his parents' home from a summer camp. This is the first time Kletzky was coming home alone with his parents' agreement.

Start the slideshow to find out how the investigators found the killer.

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A missing person sign for Leiby Kletzky ,8, is seen posted in the Orthodox Jewish section of Borough Park in the Brooklyn borough of New York
A missing person sign for Leiby Kletzky ,8, is seen posted in the Orthodox Jewish section of Borough Park in the Brooklyn borough of New York Reuters
Police stand outside the home of Kletzky, who was murdered in the Orthodox Jewish section of Borough Park in the Brooklyn borough of New York
Police stand outside the home of Kletzky, who was murdered in the Orthodox Jewish section of Borough Park in the Brooklyn borough of New York Reuters
NYPD crime scene investigators inspect the car of the suspected killer of Kletzky outside his home in the Orthodox Jewish section of Borough Park
NYPD crime scene investigators inspect the car of the suspected killer of Kletzky outside his home in the Orthodox Jewish section of Borough Park Reuters
People stand near the home of the suspected killer of Kletzky in the Orthodox Jewish section of Borough Park in the Brooklyn borough of New York
People stand near the home of the suspected killer of Kletzky in the Orthodox Jewish section of Borough Park in the Brooklyn borough of New York Reuters
The casket of Leibby Kletzky is carried out of a synagogue after his funeral service in New York
The casket of Leibby Kletzky is carried out of a synagogue after his funeral service in New York Reuters
A man weeps while listening to the funeral of Leibby Kletzky in the Brooklyn borough of New York
A man weeps while listening to the funeral of Leibby Kletzky outside a synagogue in the Brooklyn borough of New York July 13, 2011. A Brooklyn man was under arrest on Wednesday after the dismembered remains of Kletzky, who had gotten lost two days earlier walking home from camp, were found in the man's freezer and a trash container, police said. Kletzky, 8, was supposed to meet his family on Monday on his walk home from day camp in Brooklyn's Borough Park neighborhood but never arrived, police said. Reuters
Men weep while listening to the funeral of Leibby Kletzky outside a synagogue in the Brooklyn borough of New York
Men weep while listening to the funeral of Leibby Kletzky outside a synagogue in the Brooklyn borough of New York July 13, 2011. A Brooklyn man was under arrest on Wednesday after the dismembered remains of Kletzky, who had gotten lost two days earlier walking home from camp, were found in the man's freezer and a trash container, police said. Kletzky, 8, was supposed to meet his family on Monday on his walk home from day camp in Brooklyn's Borough Park neighborhood but never arrived, police said. Reuters