Police located the body of Robert Mainville, 43 of Couchiching First Nation.
Rain River District OPP officials say a local resident discovered the body at approximately 11 a.m. Sunday. Police had searched for Mainville since Thursday when they received a report about two males reported to have fallen out of a boat into Rainy Lake.
Police say they located one of the males Thursday night and then taken to hospital with non-life threatening injuries.
The investigation is ongoing.