When changing the date of death for David Roy Mickley did you forget to change the "Before" to "Exact?" :-)
Also, the Social Security death index (not always 100% accurate) lists a David J Mickley boorn November 26, 1924 and died October 2, 1987 with his last residence (or sometimes really just where their mail was going) as Prophetstown, Whiteside, IL.
Sounds like this is him even though it varies a little.