The History of the 90th Ohio Volunteer Infantry, first published in 1902, has this information in the Personal History chapter for Thomas Jenkins in Company C:

Thomas A. Jenkins, discharged May 18, 1865, at Camp Dennison, Ohio, for wounds received June 16, 1864, in action near Kenesaw Mountain, Ga.

And also this, under Post Office Addresses of Living Members:

Thomas H. Jenkins, Parrotts, Ohio.

The book (available from Amazon.com) is more a series of stories told years after the war than a history, although it also includes diary entries made during the war.