The Medical Examiner says an autopsy was conducted on Kirkingburg and showed that he died from a massive accidental drug overdose.
We're told he tested positive for Xanax, cocaine, heroin, and ethanol (alcohol).
His official cause of death is being listed as "multi-drug toxicity."
Regarding Samman ... the M.E. tells us, "We do not have any specimen on Mr. Samman due to the length of his hospitalization."
"His cause of death is probable drug overdose based on the circumstances and hospital drug screen that was positive for drugs, but we could not confirm this as they only hold specimens for three days."