A U.S. Army investigation into the death of Spc. Casey Andrew Chapman, a 20-year-old from Chelsea who was found unresponsive in February in his vehicle at Fort Hood, Texas, determined that Chapman died by suicide.

Fort Hood officials announced Feb. 6 they were investigating Chapman’s death after he was found Feb. 4 at a training area on the Army post. A post media relations specialist said Wednesday that the investigation confirmed the death was a suicide, but no other details were available.

According to Fort Hood officials, Chapman’s awards and decorations included four Army Achievement Medals, a National Defense Service Medal, a Global War on Terrorism Service Medal, a Korean Defense Service Medal, an Army Service Ribbon and an Overseas Service Medal.