Speaking to ANI, Pradhan even questioned the morality of the state government over the sensitivity of the case.
"If Naveen Patnaik has any moral responsibility left then he should offer his resignation and hand over the case to the Central Bureau of Investigation (CBI)," he said.
A class IX girl committed suicide on January 22 after being allegedly gang-raped by four security personnel in Koraput district in October last year.
The incident triggered a massive outrage across the state.
In November last year, the girl attempted to kill herself, after which Patnaik ordered a judicial probe into the incident.