Colin Kroll, the CEO and co-founder of HQ Trivia, an app and trivia game, has died of an alleged drug overdose. He was 35.

The Daily Beast reported that a senior New York Police Department official said Kroll was found dead in his apartment late Saturday from an apparent overdose. Officials said police arrived at his apartment after his girlfriend called for a welfare check.

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An NYPD spokesperson told BuzzFeed News Kroll was pronounced dead at 12:18 a.m. Sunday. The spokesperson said the department was waiting for a medical examiner's report.

Before co-founding HQ Trivia, Kroll was the co-founder of Vine. Twitter bought the popular 6-second video app in 2012, USA Today reported. The app was shut down in 2016.

Both Vine and HQ Trivia were founded by Kroll and Rus Yusupov, who issued his condolences on Twitter.

An investigation into the death is ongoing.

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Helen Gilbert places flowers on her brother Eurie Martin’s grave at Camp Spring Baptist Church in Sandersville. Her brother died eight years ago. Three former Washington County deputies are accused of causing his death and are set to stand trial Monday. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez