The former chief of Canada's largest First Nations police service has filed a more than $2.5-million lawsuit against the its oversight board, alleging he was wrongfully terminated.

Roland Morrison was terminated from the Nishnawbe Aski Police Service (NAPS) in November following an independent investigation. He had been suspended with pay in March over misconduct allegations.

"Following the conclusion of that investigation, the NAPS board of directors had made the decision to terminate Roland Mor…