Mike,
Thanks.
St Clair County, Illinois isn't too far from St. Louis, Missouri. It so happens that the St. Louis public library has an online list of soldiers who were killed during WW II and were from that city or rather, were mentioned in the St. Louis Post-Dispatch newspaper.
See
http://www.slpl.lib.mo.us/libsrc/obww11a.htm
On that list is (a) Lt Ronald Blair Sr. whose name appeared in the 29 Apr 1945 issue.
Perhaps there's a match, but I await further info from St. Louis.
Regards,
Leendert