Colin Kroll, the CEO and co-founder of popular app game HQ Trivia, was found dead in his downtown Manhattan apartment earlier today. Police believe he died of a drug overdose; he had drug paraphernalia nearby that reportedly included cocaine and heroin. Kroll was also the co-founder of the now-defunct short-form video service Vine and served as the Engineering Manager at Yahoo about a decade ago. Kroll was named CEO of HQ Trivia in 2015. The year before, he was fired from Twitter after he was determined to be a "bad manager." Female employees claimed his behavior made them uncomfortable, however, no sexual harassment claims were ever filed. HQ Trivia was having problems recently. It was steadily losing audience. In January, HQ was in the top 10 list of most downloaded iPhone games. It's now fluctuating between #250 and 500 in the U.S.