"We have recovered body of the IB officer and that of the trader yesterday from a shallow grave in a forested area in Bolchugre," South Garo Hills SP Lakador Syiem said.
They were killed a day after their abduction on September 24 and the bodies were moderately decomposed, he said.
Family members of the victims have identified the bodies as those of Singh and cloth merchant Kamal Saha, Syiem said.
The SP said the breakthrough came after police arrested and interrogated Sengran Shira, the brother of ASAK commander Sengbat Shira, who led them to the site where the duo were killed.
The bodies were handed over to the respective families after postmortem.