Colin Kroll, co-founder and CEO of the hit gaming app HQ Trivia, was found dead in his New York apartment. He was 34 years old.

On Sunday, Colin was found unconscious in the bedroom of his New York apartment, after the technology entrepreneur's girlfriend called the New York Police Department asking for a wellness check, a law enforcement source told CNN.

Colin was pronounced dead on the scene. 

"We learned today of the passing of our friend and founder, Colin Kroll, and it's with deep sadness that we say goodbye," a spokesperson for HQ said in an emailed statement. 

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.

— HQ Trivia (@hqtrivia) December 16, 2018

The Medical Examiner will determine the exact cause of death. According to news reports, drug overdose is suspected to be a likely cause of death.

Colin became a big name in the tech world after co-founding Vine, the now-defunct looping video platform that launched the careers of numerous social media stars.

Twitter bought Vine in 2012 for $30 million and shuttered the platform four years later in 2016.

Colin and business partner Rus Yusupov went on to form Intermedia Labs, the company behind HQ Trivia. 

The real-time trivia game app launched in 2017 and was a breakout success. It soared to the top of Apple's free game app chart in the first few months of 2018. However, its popularity dropped drastically later, making it drop out of the app store’s  100 most downloaded apps.