Continuing to look into WILLIAM L. SHUGART, the Indiana State Library states he died in/near Helena, Arkansas "shortly after the war." I just found a genealogy web site that states Shugart died September 07, 1864, in Grant County, Indiana, and is buried in the IOOF Cemetery, Grant County. The last letter at the Indiana State Library is apparently 26 August, 1864, or less than 2 weeks before his demise.
John