The co-founder of both Vine and HQ Trivia was found dead yesterday in his Manhattan apartment.
According to TMZ, Kroll's girlfriend called police early Sunday and asked them to check up on him after she was unable to make contact with him.
They found him unconscious and unresponsive on his bed.
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What appeared to be heroin and cocaine were found on the scene and taken for further testing, the New York Times reported.
A drug overdose is the suspected cause of death, police said, and an investigation is underway.
Kroll also was a founder of Vine, which was an app built around six-second videos, and worked for a period at Twitter, who acquired and eventually shuttered Vine.
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In September, he was named the chief executive of HQ Trivia, a smartphone-based trivia platform.
"We learned today of the passing of our friend and founder, Colin Kroll, and it's with deep sadness that we say goodbye", the statement reads. "Our thoughts go out to his family, friends and loved ones during this incredibly hard time". I will forever remember him for his kind soul and big heart. "Rest in peace, brother", he tweeted.
Time magazine said Kroll, who was reportedly fired from Twitter over poor management behavior, was facing allegations he had acted inappropriately at HQ Trivia.
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