But the many cases without a national profile that she has investigated are equally important, she said.
"The work coroners do in making recommendations and comments to prevent similar deaths occurring in the future is often low profile, but they can really make the biggest difference," Marshall said.
"I am honoured to have held the role of Chief Coroner, and am privileged to have worked with such dedicated colleagues in the Coroners Court," Marshall said.
She was appointed to the role in February 2015, taking over from Judge Neil MacLean.
Coronial appointments are made by the Governor-General on the advice of the Attorney-General, given after consultation with the Minister of Justice.