Forest officials said the incident took place at Tatigundi Kere in the DB Kuppe range near Kakanakote at about 1.30 pm.
The officer, S Manikandan, who was the Field Director of Nagarahole Tiger Reserve, had gone to the area to assess damage caused by a "mild" fire in the region last evening.
Principal Chief Conservator of Forest Punati Sridhar said Manikandan was accompanied by other forest officials.
After getting down from the jeep, they had walked for a while when the elephant attacked them from behind.
He was taken to a government hospital where doctors declared him brought dead, Sridhar said.
"He was a good officer, who was committed to the conservation of forest. He was posted as the field director of Nagarahole Tiger Reserve two years ago," he said.
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