Constable Bill McKinnon shot an Aboriginal man at Uluru. Facing up to crimes like this is part of the work Indigenous Australians have been calling on colonial descendants to do for decades – to ‘be brave’ and seek out the truth. It’s why Guardian Australia has launched this project

The killing code: strange symbols in a WA settler’s diaries lay bare frontier atrocities

Read more from Guardian Australia’s series The Descendants here

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Warning: This article contains historical records that use racist and offensive language, and descriptions of events that will be distressing to some readers. It also contains references to Indigenous Australians who have died