Los Angeles: Colin Kroll, a tech executive who co-founded the Vine and HQ Trivia apps, has died. He was 34.

The New York Police Department said officers went to Kroll's Manhattan apartment early on Sunday in response to a call by Kroll's girlfriend who was concerned about him.

Rus Yusupov and Colin Kroll, co-founders of HQ Trivia and Vine. Credit:Alamy

They found him unconscious and unresponsive on his bed and he was pronounced dead at the scene.

A NYPD spokesman said the department was awaiting results of the medical examiner's report to determine cause of death but confirmed that drugs appeared to have been involved.