Levi Aron has been charged with two counts of first-degree murder in the killing and dismemberment of Leiby Kletzky, Brooklyn DA Charles Hynes announced Wednesday evening.

The two felony murder charges were part of an eight-count indictment issued against Aron, who now faces life in prison without the possibility of parole if convicted. He is due back in court for arraignment July 28.

Hynes also mentioned the Medical Examiner's report released this morning that confirmed Kletzky's cause of death. The 8-year-old died from a lethal cocktail of drugs, including cyclobenzaprine (muscle relaxant), quetiapine (antipsychotic), hydrocodone (pain medication), and acetaminophen (Tylenol); followed by smothering.

Aron, meanwhile, is in the inmate psych ward at Bellevue Hospital, undergoing psychological evaluations that are part of his attorney's defense that seeks to keep Aron, 35, in a mental health facility rather than have to go to prison if he's found guilty.

At his arraignment last week, Aron pleaded not guilty, despite confessing to detectives that he kept Kletzky at his apartment rather than getting him home, then suffocated the boy, dismembered his body and tried to dispose of some body parts in a dumpster.

Levi Aron's lawyer, Pierre Bazile, has said he'll pursue an insanity defense for his client. At Aron's arraignment last week, his lawyer said that his client was hallucinating and hearing voices. Prosecutors, however, are simply not buying it.