The death of an airman at Grand Forks Air Force Base in North Dakota is under investigation.

Base officials say Airman 1st Class Christian Clark was found dead in his dorm room Sept. 6. The cause of his death has not been released.

Clark, from Monroe, Georgia, was a high-frequency global communications system operations technician who joined the Air Force in January 2016.

The 319th Communications Squadron commander, Lt. Jonathan Guerrero, said in a statement that “there’s a great deal of sadness left by Christian’s passing due to the many lives he touched.”