The arrest of Krishnamurthy comes 44 days after the death of Muthukumarasamy, who allegedly committed suicide because he was under pressure from the minister while recruiting seven drivers.
Krishnamurty was summoned for questioning by CB-CID official and was arrested late last night, a Senior CB-CID official told PTI.
"As part of further investigation, he is being taken to Tirunelveli," the official added.
Also, another official of the department Senthil has been arrested along with the former minister, he said.
The death of the official snowballed into a political row prompting AIADMK to drop Krishnamurthy from the state cabinet and strip him off his party posts.
