Hundreds of people at the Kent County Showground in Detling watched on as the man plunged to the ground after being fired around 40 feet (12 meters) into the air.
"The last picture I`ve got of him, you can see the net is flat on the floor," eye-witness Rob Hutchinson said. "It`s not up in the air, and he is coming down head-first towards the ground. I saw him hit the floor and bounce.
"It was deathly silent," he added. "That`s when the announcer said, there`s been a bit of an accident."
According to Hutchinson`s wife, the net "completely collapsed the minute the cannon went off".
A Kent Police spokesman said: "A man taking part in a human cannonball event this afternoon has died after it is believed a safety net failed to engage.
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Editor: Bambang
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