Mitragynine is an indole-based alkaloid and the most abundant active alkaloid in the Southeast Asian plant Mitragyna speciosa, commonly known as kratom. The total alkaloid concentration in dried leaves ranges from 0.5 to 1.5%. From Wikipedia
The 36-year-old influencer died from cardiac arrhythmia due to myocardial fibrosis, according to the Maryland Chief Medical Examiner.