After Kroll's girlfriend received no response when she called him, she asked NYPD to visit his New York City apartment.[8] Kroll was found dead at the age of 34[1] of a drug overdose.[9] Drugs found in his system include fentanyl, fluoroisobutyryl fentanyl, heroin and cocaine, the examiner said.[10]
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He passed away from his battles with addiction, not really from "working too hard".