A belt was found near Narayan Devi's body, the officer said.
The report has ruled out any foul play and said that she died due to "ante-mortem" hanging, he added.
Police had already received the post-mortem reports of the other 10 members.
The post-mortem reports of the 10 other members of the Chundawant family said they died due to hanging and no external injury marks were found on the bodies except for a few scratches, the officer had said yesterday.
"The final opinion states that the family members died due to ante-mortem hanging," he added.
Bhavnesh's wife Savita (48) and their three children -- Neetu (25), Maneka (23) and Dhirendra (15) -- were also found dead.
The police had also found 11 diaries, which contained "psychological musings" and certain things written about the "road to god".
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)