Dozens of activists are commemorating a farmer who died in a hospital almost a year after being knocked unconscious by water cannons during protests against South Korea's government.

Baek Nam-gi had been at Seoul National University Hospital since he fell and injured his head during the demonstration last November protesting President Park Geun-hye's labor policies.

The hospital says Baek died Sunday of an acute kidney injury.

Police had sought a warrant to conduct an autopsy to find the exact cause of his death, but a court rejected the request.

Activists say no autopsy is needed because it's obvious Baek died because of the water cannon.

About 200 activists were at the hospital Monday to block authorities if they try again to get an approval for an autopsy.