Colin Kroll, the co-founder of Vine and HQ Trivia, was found dead Sunday inside his New York City apartment. He was 34.
Kroll was discovered by police officers after his girlfriend called and asked for a wellness check, CNN reports. The cause of death has not yet been determined.
HQ Trivia, a trivia game app, was launched in 2017. Kroll became CEO of HQ Trivia's parent company, Intermedia Labs, earlier this year after his business partner Rus Yusupov was forced out, Recode reports. Recently, Kroll was accused by an HQ Trivia employee of "inappropriate and unprofessional behavior;" the matter was investigated and "yielded no concerns," the company told Recode.