The woman's bruised body was found last week in a thick forest at Canacona, a few km away from her house. Medical examination had revealed that she was raped and murdered.
A reward of Rs 50,000 has been announced for the person who can provide information about the assailant, Deputy Inspector General of Police O P Mishra told PTI today.
The identity of the informant would be kept secret. The information can be given to SP or Dy SP of crime branch or to SP South Goa, he said.
Canacona locals had protested on February 2 and 3 at the police station, demanding that the investigation be handed over to the crime branch.
The protestors had blocked the traffic in Canacona, the southern most taluka of the state, accusing police of lethargy in investigating the rape and murder.
The state government yesterday transferred the case to the crime branch.