More than four years ago, the Federal Bureau of Investigation appealed to the public to help identify the narrator in one of the Islamic State’s best-known videos, showing captured Syrian soldiers digging their own graves and then being shot in the head.

Speaking fluent English with a North American accent, the man would go on to narrate countless other videos and radio broadcasts by the Islamic State, serving as the terrorist group’s faceless evangelist to Americans and other English speakers seeking to learn about its toxic ideology.

Now a 35-year-old Canadian citizen, who studied at a college in Toronto and once worked in information technology at a company contracted by IBM, says he is the anonymous narrator.

Read more: New York Times