Hussain's death was confirmed in a tweet from Brett McGurk, the Deputy Special Presidential Envoy to the Global Coalition to Counter ISIL.
Hussain is believed to be a computer expert and propagandist for the terror group, which is known for its effective use of online recruitment. Hussain was tied to the Garland, Texas cartoon contest shooting this past May. Prior to the attack one of the gunmen posted a statement on social media urging others to follow Hussain on Twitter.
Hussain is also believed to be responsible for producing ISIS “kill lists,” calling on people to target specific Americans.
Hussain's death marks one of a number of the ISIS leaders recently killed by US airstrikes. The group's most senior leader, Abu Bakr al-Baghdadi, remains at large.