A neighbourhood dispute in Lackawanna Street, Cringila, led to Albert Sellwood picking up a rifle and taking aim at a man working on the roof of a nearby garage.
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His son, Jack, had hired the rifle a few weeks earlier from the Ern Webb store in Wollongong.
While at home practising his piano accordion on a Saturday afternoon in 1950, Jack heard a shot ring out and his mother say "Dad's outside with a gun".
Albert Sellwood's target was neighbour Walter Mock, who was a few doors down helping a Polish family build a garage.