Marriage records aren't available after a certain date ( 1940's I think in Vic)for privacy reasons.
The Electoral Rolls are available to anyone, anywhere in Australia - so you can always pop into your local office and check out the Vic ERs...the more recent ones are computerised so easy to search
I haven't found a death for Ondrej - I checked the Kew cemetery and the main ones in Melbourne, but nothing came up - probably needs a better look though as I just checked quickly
Also, not sure where Ondrej is in 1972 - no ER for him
At least you know he was married by 1977 at any rate!
Facebook is quick and easy - the ERs take a bit longer...