I am not sure if this will help or hinder.I hope you have found him by now, but in case you haven't, here is what I came up with in a quick search: Rene Cianciola born 1952 in California married Melvin Hilbert in July of 1972 in Las Vegas and they divorced in 1976 in California.in 1996 she lived 963E Foothill Blvd. Glendora, CA. I have found the address of a Charles W Dow in Oceanside, CA, 2150 Foster St.This is from the 1990's timeframe, so I don't known if this would be correct now either. I did find another marriage in Las Vegas of a Charles W. Dow to Joan E. Blackburn 31 Dec 1973. Just wondering if you are sure the middle name of Wayne.If so, I'll keep looking, but if if could possibly could be Wesley, There is a birth record in Los Angles for a Charles Wesley Dow, born 7 Oct 1954.This would be the right age if your mother and he were about the same age.
I did check death records, and unless he was in Illinois, I don't find a record of death.