Stillman, 43, lived in Norton near Akron.
Autopsy results determined the cause of death was a heart attack, according to National Guard spokeswoman Stephanie Beougher.
The soldier, a 19-year-member of the Guard, was an operations officer for the 2nd Battalion, 174th Air Defense Artillery Brigade in McConnellsville. He is survived by a wife and two children.
In recent years, the air defense unit has deployed to Washington, D.C., to safeguard the skies around the nation’s capital.
Additional information was not immediately available.
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