This is all I have on him so far. Not sure his connection I am expecting it may be his wife who is related.
I did get a photo yesterday of the monument head stone in Wooster cemetery in Danbury CT.
In addition to what I posted I found this last night:
1870 US Census list William Leonard Born about 1853 (headston says 1852)
On the head stone with him are Ida Dickens Leonard, Armenia Rockwell Dickens and Charles Wesley Dickens.
In 1870 he was living in Danbury Ct. states he is born in Ohio. People living in the home are :
So other than Julia that really doesnt help with who his parents are.
Ida F. Dickens Humiston Born Canbury; Connecticut dau of Charles and Armenia Sears Married William A. Leonard 25 Nove 1904 Manhattan, New York
Now the good part. there is another Ida Dickens or else some census worker really messed up big time. Same age. Danbury CT but her parents are George Dickens and Alice B. Dickens. I am going with the names on the head stone as being the correct parents which are Charles and Armenia.