Grajeda was the daughter of a Galas, Quezon City-based businessman and had a daughter with her husband.
Police said Grajeda was last seen alive Sunday in the company of her husband.
The couples housemaid discovered the victims body when she forced herself inside the room after Grajeda failed to answer repeated knockings on the door. Grajeda was already dead by then. Police probers found a belt near the bed, which they believed to have been used by the suspect in strangling Grajeda, who has welt marks on her neck.
The local police refused to release details of the incident to the media for fear of jeopardizing ongoing follow-up operations.
Meanwhile, the Rizal police Criminal Investigation and Detection Division (CIDG) under Superintendent James Brilliantes has joined the probe on Grajedas mysterious death.