Raising serious allegations over the death of Rasila Raju, the Infosys software engineer who was murdered at her office in Pune on January 29, her family on Monday demanded a CBI probe into the case.

The close relatives of Rasila Raju said in Kozhikode that there is every possibility that there could be more than one person involved in the murder.

The police have arrested Bhaben Saikia, an Assamese who worked as a security guard, for murdering the techie.

"The authorities are trying to close the case by just framing Saikia. She has never ever said that Saikia was troubling her. She had raised complaints against a company manager also. The crime cannot be done just by one person. For the truth to come out, we demand a CBI probe," said her close family members.

"She last spoke to her cousin and that call was abruptly disconnected by her saying that some people are coming," said her father.

They also said that the post-mortem examination report indicates that a tussle took place before the murder as there are bite marks on her left shoulder.

Her father, a retired Army officer, O. Raju, said she was unhappy being at Pune and was seeking a transfer to Bengaluru.

The relatives said that they will be returning to Pune soon after all the rituals associated with her death are completed and would file further complaints.