India, June 1 -- Satyabrata Kumar, a 2004-batch Indian Revenue Service (Customs and Indirect Taxes) officer who spent more than a decade handling some of the Enforcement Directorate's (ED) most high-profile investigations, has taken voluntary retirement from service after a career marked by major financial crime probes, international extradition efforts and asset restitution initiatives.

Kumar's request for voluntary retirement was approved by the Chief Commissioner, Central Goods and Service Tax and Central Excise, Kolkata, on May 19. The 48-year-old officer was serving as Commissioner (Appeals), Siliguri, West Bengal, and was relieved from service with effect from April 28.

Widely regarded within the ED as a skilled investigator of co...