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Chetia, a 2009-batch IPS officer, allegedly shot himself with his service weapon inside the ICU where his wife died, they said.
He had earlier served as SP of Tinsukia and Sonitpur districts, and commandant of the 4th Battalion of the Assam Police before being posted as the home secretary of the state.
His wife was suffering from brain tumour and was admitted to the hospital for the last few months.