A 15-year-old Nelson boy found dead with a cord around his neck was the victim of a "fatal accident" while practicing tying knots, a coroner has found.
Coroner Carla na Nagara has ruled Ethan Herron accidentally hung himself on April 17 last year, after spending the day playing amongst trees and bushes with his great-grandfather's electric drill.
He did not respond when his mother Greta Herron called out to him twice at about 4:30pm and 6pm.
Ms Herron went outside to squirt him with a bottle of water after the second call, thinking he was ignoring her and hoping she would make him laugh.
When he didn't respond, she noticed his lips looked "funny", the report said.