Colin Kroll, co-founder of the popular HQ Trivia game and the Vine apps, died of drug overdose, including fentanyl, cocaine and heroin, according to officials.
The chief physician of the New York City wrote Kroll's death to "acute poisoning from the combined effects of fentanyl, fluoroisobutyryl-fentanyl, heroin, and cocaine."
HQ TRIVIA, WINE CARBON COLIN KROLL TOT AT 34
A note sent to the Examiner's office on Tuesday described the 34-year-old's death as accidental.
Kroll was found dead in his apartment in New York City in December.
The entrepreneur was chief executive of the trivia app HQ Trivia, which shows users short trivia representations and became popular after its release in 201
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He is also co-founder of Vine, a now defunct app that consists of six-second video clips. After buying Vine in 2012, the entrepreneur worked for some time on Twitter.
Nicole Darrah of Fox News' contributed to this article. Follow James Rogers on Twitter @jamesjrogers