As reported by NBC News, Naroditsky had methamphetamine, amphetamine, 7-hydroxymitragynine and mitragynine in his system at the time of death, according to a toxicology report, with the last two likely stemming from a supplement known as kratom.

NBC News brought the breaking news on the toxicology report
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All of the substances can lead to addiction or even death depending on the quantities ingested, and are likely the cause of his death. Since kratom is not typically linked to suicide attempts, it seems highly improbable that the young American would have taken them as a means to end his troubles and sorrows forever.
Vladimir Kramnik, who had been known to have voiced many doubts as to Naroditsky's online integrity, with numerous rebuttals by Naroditsky himself, had been accused online of having been the cause of suicide.
Feeling vindicated, he posted Tuesday, "I deeply regret that this profound tragedy was exploited by various individuals and groups to advance their own agendas", Kramnik said in the statement. "There can be no justification for such immoral conduct".
It must be pointed out, however, that kratom as a supplement is typically used, among other things, as a means to self-medicate against anxiety, stress, and depression. It is undeniable that his mental health had been compromised, as stated in his own words online, perhaps leading him to seek such alternative treatments.
A reader, and MD, Andrei Iordachescu, sent us his professional evaluation after reading the full medical examiner's report himself:
I have reviewed the official medical examiner's report, and it clearly states the following :
- The concentrations of methamphetamine, mitragynine, and their metabolites in the decedent’s blood are at levels considered non-toxic/non-lethal inforensic toxicology.
- The concentrations of methamphetamine and mitragynine in the decedent’s blood on postmortemtoxicology are not considered fatal on their own.
- Based on the circumstances, history, and postmortem findings, it is my opinion that the cause of death in this case is Probable cardiac arrhythmia due to Probable cardiac involvement of systemic sarcoidosis;methamphetamine and kratom (mitragynine) use are contributory. The manner of death is Accident.
In other words, Daniel Naroditsky likely died from heart complications related to sarcoidosis. The drugs found in his system did not help, but were not at levels considered toxic, much less lethal.