New York ( CNN ) -- A New York man accused of drugging , smothering and dismembering an 8-year-old Brooklyn boy has been deemed mentally competent to stand trial , attorneys revealed in court Thursday . Prosecutors say Levi Aron abducted the boy , Leiby Kletzky , from his Brooklyn neighborhood on July 11 . The accused then took Leiby to his apartment and killed him , they contend . Aron pleaded not guilty Thursday in a Brooklyn courtroom . Aron did not enter a plea at his arraignment last month , and he was under a suicide watch . A mental evaluation that his attorneys asked be conducted on their client was revealed in court Thursday . Kings County District Attorney Charles Hynes applauded the decision . `` Now that Mr. Aron has been found fit to proceed we will move forward expeditiously to bring his case to trial . I want to reaffirm that this case will go to trial and that there are absolutely no circumstances which would lead me to accept a plea bargain , '' Hynes said . New York City 's chief medical examiner said that Leiby died after being drugged and then smothered . The autopsy results for Leiby listed a cocktail of four prescription and over-the-counter drugs in the boy 's system : cyclobenzaprine , a muscle relaxant ; quetiapine , an antipsychotic drug ; hydrocodone , a pain medication ; and acetaminophen , the drug found in Tylenol , according to the medical examiner 's office . Leiby disappeared while walking home alone from summer day camp . Police located human remains in Aron 's freezer during a search of the Brooklyn neighborhood as well as in a trash bin . Both Aron and Leiby are members of the borough 's close-knit Orthodox Jewish community , although police say it does n't appear that they knew each other . `` Everybody says , 'We 're not going to talk about it , ' but how can you not talk about it ? How can you not talk about a tragedy that has affected every single family , '' Assemblyman Dov Hikind told CNN affiliate WCBS-TV . Authorities have detailed some of the evidence they allege links Aron to the kidnapping and killing -- including extensive video footage that shows Leiby talking to a man and following him to a brown car authorities later traced to Aron . Detectives later concluded that Aron was also the man they saw in the video footage . New York Police Commissioner Ray Kelly said last month that Aron told authorities he was sorry for the trouble he has caused . Statements made by the suspect indicated that he kidnapped Leiby and , as the neighborhood search for the boy intensified , he panicked and killed him , Kelly said . `` His mental capacity is a question for the doctors , '' Hynes said . Aron 's attorney at the time of his initial arraignment said he hears voices and hallucinates . `` He 's been hearing voices for quite some time , '' Gerard Marrone told reporters last month , adding that Aron tries to silence the voices by listening to music . `` He listens to it with earphones and he listens to it very loud , and that helps him quell some of his voices . '' Marrone has since resigned from the case . `` I have sincerest concerns about the defendant 's mental state and his cognitive abilities , '' said Pierre Basile , who is representing Aron . The commissioner called the case `` heartbreaking . '' `` Obviously , in this business you see a lot of violence , but there 's usually some sort of irrational twisted logic that 's given to why a violent event took place , '' Kelly said . `` Here , I mean , it 's just , it defies all logic and I think that 's what 's really so , so terribly disturbing about this case . There 's absolutely no reason . There 's nothing more innocent than an 8-year-old child . '' On the day he disappeared , Leiby was supposed to meet his parents after walking seven blocks from day camp , but he became lost and asked the suspect for directions , Kelly said . Surveillance video showed Aron entering a dentist 's office while Leiby waited for him across the street for seven minutes , Kelly said . Aron claims he took Leiby to a wedding in Monsey , New York , and then brought him back , Kelly said . Police said Aron went to the wedding , but they have not been able to confirm that Leiby went with him , as no one has said they saw him . According to Kelly , police showed up at Aron 's third-floor attic apartment at 2:40 a.m. July 13 and asked him about Leiby 's whereabouts . The suspect pointed them to the kitchen , where blood was visible on the freezer handle . Inside the refrigerator was a cutting board with three blood-spattered carving knives , Kelly said . Remains were found in Aron 's freezer and in a trash bin more than two miles away , wrapped in a black plastic garbage bag inside a suitcase , Kelly said . Aron was a clerk at a maintenance supply company , authorities said . His only known criminal summons was for urinating in public last year . CNN 's Jesse Solomon , Nina Raja , Nina Golgowski and Leigh Remizowski contributed to this report .
Levi Aron has been accused of beating , smothering and dismembering the victim . He has pleaded not guilty to involvement in year - old 's death . Suspect has been found mentally competent to stand trial , attorneys say . Suspect and victim are members of a close - knit Orthodox Jewish community in Brooklyn .