Colin Kroll, co-founder of the popular smartphone-based trivia game HQ Trivia, was found dead at his New York apartment on Sunday, local media reported

A New York Police Department spokesman told Ars that Kroll died of a drug overdose.

Citing anonymous police sources, the New York Post says Kroll was found with marijuana and heroin near his body. He was 34.

In 2012, Kroll also co-founded Vine, a popular video looping app that was quickly acquired by Twitter and shuttered four years later.

HQ Trivia issued this tweet on Sunday afternoon:

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

Fellow co-founder Rus Yusupov also tweeted:

So sad to hear about the passing of my friend and co-founder Colin Kroll. My thoughts & prayers go out to his loved ones. I will forever remember him for his kind soul and big heart. He made the world and internet a better place. Rest in peace, brother. — Rus (@rus) December 16, 2018

HQ Trivia is a live online game that awards cash prizes that became incredibly popular in the months after its August 2017 debut, but its popularity has since waned.