In July 2012, the Tokawade police had found a highly decomposed body of a man, aged around 35 years, at Malshej ghat, assistant police inspector H C Patil said today.
The police had then sent the body for postmortem and it was later identified as that of one Santosh Anant Rasal, a resident of Vartak Nagar in Thane city.
A case of accidental death had then been registered.
Based on her complaint, the Tokawade police launched a fresh probe in the case and yesterday registered an offence against Santosh's widow and her male friend for an offence under section 302 (murder) of the IPC, Patil said.
It was suspected that Santosh was a hurdle in the affair of his wife with her friend on account of which they allegedly killed him and dumped the body at the Malshej ghat.
Investigation was on to ascertain the exact cause of Santosh's death, he said.