Despite the alleged confession, police and prosecutors say they are continuing to work on verifying Aron's horrific and bizarre explanation for the boy's death. It remains unclear why Aron would have taken the child in the first place.
The medical examiner's office said the boy was given a cocktail of prescription drugs. But Aron's confession didn't mention that, and he denied ever tying up the boy.
The suspect was asked if he wanted a kosher meal. "No, I'll eat anything," he replied, according to the documents. They considered McDonald's before settling on Chinese food.
Before the arraignment, State Assemblyman Dov Hikind told reporters that the victim's family and community were still coming to grips with the gruesome slaying.
"The idea of an insanity defense is just not acceptable," Hikind said. "He planned and plotted this entire horror that he committed."
A pretrial hearing was set for Oct. 14.