Mondal, Birbhum district president of the party, had allegedly asked partymen to attack the police with bombs and burn houses of Independent candidates.
A few days later, Sagar Ghosh, father of Hriday Ghosh, an Independent candidate from Parui, was killed in an attack allegedly by Trinamool activists.
The family had lodged an FIR with the police which did not take any action.
Altogether 41 people are accused in the case including Mondal for inciting the violence through his 'inflammatory speeches'.
The investigative agency is likely to submit its report to the court within a month.