OBITUARY FROM FIND-A-GRAVE WEBSITE:

Donald Keith Heller
Birth          13 Nov 1943
Death          29 Feb 2008 (aged 64)
Burial         Abraham Lincoln National Cemetery, Elwood, Will County, Illinois, USA
Plot           Section G3 Site 450
Memorial ID    44558276

This information and the picture below were obtained from: https://www.findagrave.com/memorial/44558276/donald-keith-heller. The picture above was obtained from the 1962 HHS Memories yearbook (when Don was a junior), made available by the Lake County Public Library, at: https://archive.org/details/HOHS1962Images/.

INFORMATION FROM ANCESTRY.COM:

The marriage information was obtained from: https://www.ancestry.com/search/collections/61009/records/1564838.

This death certificate information spells his parents' name "Kekelik", and was obtained from: https://www.ancestry.com/search/collections/60716/records/2808702?tid=&pid=&queryId=631710d3-e45a-4bba-ac4e-39d82a2d1ba0&_phsrc=uWA5947&_phstart=successSource.