If you have not already found it, the death certificate for Benjamin Halderman is online here:
http://genealogy.az.gov/However:
This Benjamin Halderman was married to Emma; according to the death certificates of two of their sons at the same link, she was Emma Snyder/Schneider.
Census records for 1880-PA, &1900,1910-AZ give their children as Charles,Edmund,Benjamin F. and Ada Emma. The boys all born in PA, and Ada born in AZ; at that same link you will find several birth records for children of Ada Halderman who married Charles McKinney, and various birth records for children of the male Halderman's.