Thirty-two-year-old Thirunavakarau, an engineering graduate, died on the spot after he was attacked by the bull, while another man "died of shock" when another bull ran towards him.
The bull dashed into the barricade, behind which the man was standing. Out of shock, he suffered a cardiac arrest, collapsed and died on the spot, police said.
A total of 80 persons, mostly bull tamers, were injured in the event, they said.
Most of the injured were treated as outpatients at the medical outpost set up at the venue, while a few others were hospitalised.
Besides this, five persons were injured in a clash between two groups of bull tamers over the reported wrong announcement of the prize winners by the organisers.
Most of the prizes, including motorbikes, were damaged in the violence, police said.
Ten persons have been detained in connection with the clash, they added.
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