FORT RILEY, Kan. (AP) — Officials at Kansas’ Fort Riley are publicly identifying a soldier chaplain they say died suddenly last week in Manhattan.

The Topeka Capital-Journal reports that the cause of 45-year-old Capt. Yohan Lee’s death April 9 remains undetermined.

Lee was a chaplain assigned to the Third Assault Helicopter Battalion, First Aviation Regiment, First Combat Aviation Brigade, First Infantry Division.

He arrived at Fort Riley in January 2014 from Virginia.

Col. John Cyrulik says Lee “gave so much of himself to the Soldiers and families of this brigade,” and that “Our hearts are heavy” because of his death.