She has represented children, young people and vulnerable people in the Family and Youth Courts as well as appeared as lead counsel in criminal jury trials.
"It is an honour and a privilege to be appointed the Tai Tokerau/Northland coroner," Tetitaha said.
"I hope to serve my people well."
Tetitaha is of Ngāpuhi, Ngati Raukawa, Ngāti Manu, Ngāti Hine and Patukeha descent and lives in Whangārei with her husband Judge Gregory Davis.
She will be sworn in at a ceremony at the Whangārei District Court today at 4pm.
Coroners are qualified lawyers appointed as judicial officers to look into unexpected, violent or suspicious deaths. They make comments or recommendations if something can be done to prevent similar deaths.
They are appointed by the Governor-General on the advice of the Attorney-General, given after consultation with the Minister of Justice. Minister of Justice Andrew Little, has been consulted and confirmed Tetitaha's appointment.