"We are searching for a suicide note, either in a soft copy or hard copy, as investigations so far have revealed that there were high chances that the wife first killed her husband and then committed suicide," a senior police official said.
The couple's daughter reportedly told police that her mother was emotionally disturbed and used to have frequent fights with her father.
The theory gains prominence as the postmortem report suggested that Kumar died due to the cut in his throat when he was asleep.
The time of death, in the report, suggested that Kumar died first due to slitting of throat, followed by his wife by hanging.
The incident came to light on Friday evening at around 4:15 when Kumar's daughter Varanya (22) reached home and found the main door of the house latched from inside, which was not opened by anybody even after she rang the bell several times.
When she tried to peep into one of the rooms through the window, she saw her father lying inside in a pool of blood after which she raised an alarm, police had said.
