The suicide notes, one of which was addressed to the victim Sumitra's father-in-law Sardar Singh and the remaining two were meant for her husband Dinesh, were handed over to the police by Singh on September 2.
While the suicide notes pointed out the involvement of the deceased's brother-in-law Gainda Ram (35), they also mentioned that Sumitra's husband Dinesh "was not responsible for her demise".
Police claimed that Gainda Ram had been allegedly exploiting Sumitra sexually for the last several years and had not spared her even after she got married to Dinesh in November, 2012.
Further probes are on into the matter, they added.
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The victim had committed suicide by jumping into a pond near her paternal house at Sulkha village on August 30.
Her father Jai Singh had later filed a complaint against his son-in-law, alleging that he had been "ill-treating" his daughter over dowry.
Sumitra returned to her parents' house when situation became unbearable, Singh had said in his complaint.