The police said 59-year-old Dhaneswar Prusty's body was discovered from the computer room of the District Welfare office at Rayagada yesterday.
He had left home around 10.30 AM yesterday for office saying he had to complete some work though it was a holiday because of Mahashivratri.
"When he neither returned home nor took calls, his wife went to the office to check. She found him hanging in the head clerk's room," Inspector In-Charge of of Rayagada police station, Kapileswar Behera, said.
The SP said a suicide note had been recovered from Prusty's house.
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Prusty's wife Kamini Sahu filed an FIR accusing District Collector S B Padhi and project director of Integrated Tribal Development Agency (ITDA) of harassing her husband who was also under severe work pressure.
Terming the death of Prusty as a "sad incident", Padhi said "Pressure is natural for anyone who holds such an important post. After all Rayagada is a big district. After the probe, things will be clear."
Congress members demanded a ruling from the Speaker and a statement from the Chief Minister on the issue.
Opposition chief whip Tara Prasad Bahinipati said, "Earlier, one lady teacher was killed as the present district collector of Rayagada did not address her problems. Now the DWO committed suicide out of frustration."
Prusty, a native of Nayagarh district joined as DWO in Rayagada on October 10, 2014.