West Australian Greens Senator Dorinda Cox has been appointed as the party’s new First Nations spokesperson after Lidia Thorpe’s resignation last week.

The Yamatji-Noongar woman was given the position as the party officially begins its campaign for a yes vote in the upcoming referendum on an Indigenous Voice to Parliament.

Thorpe announced last Monday she would quit the party to become a champion for the black sovereignty movement.

Senator Cox – the first female Indigenous senator from Western Australia – has said she and Thorpe are “very different politicians” but pledged to also work on treaty and truth while back a voice to parliament.

The former police officer initiated a Senate inquiry into missing and murdered First Nations women and children in November 2021, which is due to deliver a report in July.