Madhumita's younger sister Nidhi Shukla, accompanied by her mother and brother, has been campaigning here against the former minister.
The accused were charged under various IPC sections pertaining to murder, criminal conspiracy, destroying evidence, abetment to offence and wrongful confinement.
But questions are being raised about the fairness of the investigation after the recent transfer of several senior police officers.
The ruling SP declared the candidates for nine assembly seats besides changing the candidates of 14 constituencies ahead of the 2017 UP polls.