Hahn died a year ago, age 39, likely due to fentanyl.
Wikipedia says he died of alcohol poisoning[1], however the actual medical examiner's report says, "intoxication by the combined effects of alcohol, fentanyl and diphrenhydramine."[2] It goes on to say that the blood alcohol concentration was 0.404 mg/dL. Unless there's a misplaced decimal point, that level is almost nothing; it's a trace of alcohol. The legal limit for drunk driving in all 50 states is 80 mg/dL, or two hundred times greater than what he had.
Diphenhydramine, also mentioned by the medical examiner, is an over-the-counter anti-allergy medicine. It is apparently used as an intensifier for opioids (like fentanyl).
So it seems his death was really caused by fentanyl. The medical examiner mentions alcohol only because he has to state all factors no matter how minor.
[1] https://en.m.wikipedia.org/wiki/David_Hahn
[2] https://www.documentcloud.org/documents/3517279-1-Page-Fax-F...