Kroll, 34, died of an alleged drug overdose, according to TMZ.

Kroll faced criticism throughout his career. At Vine, Kroll was fired for poor management, and had made some female colleagues uncomfortable with some of his behavior, Recode reported earlier this year. At HQ Trivia, his promotion to CEO came shortly after an employee filed a formal complaint against him to HR about his aggressive management style; the board investigated the complaint and found it “yielded no concerns.” 

Still, Kroll was known as a strong engineer and did something that few entrepreneurs are able to do: He created two industry-wide hits in Vine and HQ Trivia. Vine was key in helping spur a whole new generation of internet celebrities and creators. Some hold out hope that HQ Trivia’s mobile, interactive game shows might be the future of television.

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