Green’s Dictionary of Slang

crippen n.

[Hawley Harvey Crippen (1862–1910), American doctor hanged in England for the murder of his wife]

(Aus.) a bush cook.

[Aus]Baker Aus. Lang. 79: Outback cooks have been known by many names [...] bab, babbler, babbler’s offsider, babblins, baitlayer, doctor, blacksmith, poisoner and crippen.
W.F. Wannan Fair Go, Spinner 126: ‘Crippen’, ‘poisoner’, ‘bait-layer’, are other terms for a bush cook.
W.F. Wannan Book of Aus. Yarns 372: A bush cook was often called a ‘crippen’ after the notorious poisoner.