Leiby Kletzky vanished late Monday afternoon after getting lost during what was supposed to have been a seven-block walk from his day camp to a meeting spot with his mother.

Investigators later used a surveillance video to trace the missing boy to Levi Aron, a hardware supply store clerk the boy had apparently asked for directions.

Detectives found the boy’s severed feet, wrapped in plastic, in the man’s freezer, as well as a cutting board and three bloody carving knives. A plastic garbage bag with bloody towels was nearby.

A law enforcement official, speaking on the condition of anonymity because the investigation has not been completed, said that Aron also told investigators that after taking Leiby off the street and bringing him to his home, he brought the boy to a wedding in the suburb of Monsey and spent several hours there Monday evening.

Investigators were trying to determine whether that was true. Detectives have been reviewing videotape from a wedding reception and interviewing guests, the law enforcement official said.

Aron told police he killed the child Tuesday in a panic after learning that a massive search was under way.

Brooklyn District Attorney Charles Hays said he plans to charge Aron with felony murder, and was also investigating whether he might have had any improper contact with children in the past.

Aron’s lawyer, Pierre Bazile, said he expected his client to be arraigned Thursday.

“From the Aron family, they’d like to extend their condolences to the family of the boy,” he said, adding they would let the justice system work and would not make any further statements.

Thousands of mourners gathered in Brooklyn on Wednesday evening for the boy’s funeral. The funeral came just hours after police discovered Leiby’s remains.

Leiby disappeared Monday afternoon while on his way to meet his mother on a street corner seven blocks from his day camp, the first time the young Hasidic child was allowed to walk the route alone. Authorities said he had evidently gotten lost after missing a turn, and had reached out to Aron, a stranger, for help.

The killing shocked the tight-knit Hasidic community in Borough Park, in part because it is one of the safest sections of the city and because Aron is himself an Orthodox Jew, although not Hasidic. The Hasidim are ultra-Orthodox Jews.

While the medical examiner’s office said it was still investigating how the boy was killed, the body was released so that the boy could be buried Wednesday evening according to Jewish custom.

The break in the case came when investigators watched a grainy video that showed the boy, wearing his backpack, getting into a car with a man outside a dentist’s office. Detectives tracked the dentist down at his home in New Jersey, and he remembered someone coming to pay a bill. Police identified Aron using records from the office, and 40 minutes later he was arrested, shortly before 3 a.m. Wednesday.

Aron told police where to find the rest of the body; it was in pieces, wrapped in plastic bags, inside a red suitcase that had been tossed into a trash bin in another Brooklyn neighborhood, Kelly said.

Police said there was no evidence the boy was sexually assaulted, but they would not otherwise shed any light on a motive except to say Aron told them he “panicked” when he saw photos of the missing boy on fliers that were distributed in the neighborhood. Police were looking into whether Aron had a history of mental illness.

Police said Aron, who is divorced, lives alone in an attic in a building shared with his father and uncle.

Kelly said it was “totally random” that Aron grabbed the boy, and aside from a summons for urinating in public, he had no criminal record.