A passerby reported seeing an overturned Beaver floatplane in the water near Stuart Island, north of Campbell River, at 5:00 p.m. on Tuesday, said Lt.-Cmdr. Desmond James of the Joint Rescue Coordination Centre in Victoria.
A helicopter from CFB Comox and two coast guard ships were dispatched to the scene.
"Search and rescue technicians found one male aboard with no vital signs," said James.
Crews are searching the area for any other passengers who may have been on board.
James says there were no witnesses to the crash, which makes it difficult to determine the circumstances leading up to the crash.
"It's kind of unusual no one saw anything. The only reason we know is the concerned citizen called 911," he said.
Last month, an American tourist died after a helicopter crashed into the Homathco river nearby. Five others, including the pilot survived.
- One dead in helicopter crash north of Campbell River