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The co-founder of the popular app HQ Trivia, Colin Kroll, has been found dead in his apartment in New York at the age of 34.
The CEO, who also co-founded the video platform Vine, was found by police after his girlfriend reportedly asked them to check on him.
An HQ spokesperson confirmed the death "with deep sadness".
HQ Trivia, a live trivia game on mobiles, became hugely popular, although its appeal waned this year.
Officers of the New York Police Department went to Kroll's flat in Manhattan to carry out a welfare check and found his body along with drugs paraphernalia nearby, TMZ reported in the initial media coverage of his death.
The HQ statement read: "We learned today of the passing of our friend and founder, Colin Kroll, and it's with deep sadness that we say goodbye. Our thoughts go out to his family, friends and loved ones during this incredibly difficult time."
The company confirmed Kroll's age after police had initially said 35.
Kroll's father, Alan, told the New York Times: "He had so much talent and had accomplished so much at such a young age. It truly is a waste."
Kroll co-founded HQ Trivia with Rus Yusupov, reports the BBC.
HQ Trivia was launched in the US last year and Kroll was named CEO this September.
The free app live-streams quiz shows, with a pot of money - often thousands of dollars - available to split between winners.
The quiz show was guest-hosted by some big names, from Jimmy Kimmel to Bert from Sesame Street.
Its popularity faded this year, dropping out of the App Store's list of top 100 apps.
Kroll was also a co-founder of Vine, a six-second video streaming service that was bought out by Twitter in 2012 for $30m (£24m).
Vine announced in December 2016 that Twitter was discontinuing the mobile app.