The Nishnawbe-Aski Police Service has asked the OPP to investigate the circumstances surrounding the death of a person in custody.
OPP say 23-year-old Lena Anderson died Friday evening while in detention at the NAPS detachment at Kasabonika Lake First Nation.
NAPS said the OPP Criminal Investigation Branch is now looking into the incident.
No other information was released.
Kasabonika Lake is about 600 kilometres northeast of Thunder Bay.