Well, I can't help with why the death record won't open for you but I found this record for free through Victoria Historical BMDs...
Edited: well, the link won't work for me now but the record I found has father as James Kilpatrick and mother's maiden name Martin.
PB
Added: found the record again...
Looks like mother's first name is Agnes, William's place of death Wonthagg, age 49, year 1935, reg. number 18972/1935. You can apparently order a copy through this website but I don't know what it would cost or how secure the website would be.
This is a lot more info than you would have acquired from the ancestry entry
Hope he's yours.