"I once again request you to take up the matter with the US authorities to ensure that exemplary punishment is meted out to the assailants," Patnaik said in a letter to External Affairs minister S M Krishna.
Patnaik recalled that he had earlier requested the ministry to advise the Indian Embassy in Washington to follow up with the US authorities investigation in the case.
The slain student`s parents have blamed both the Centre and the state government for no progress in the investigation into the killing. Seshadri`s father K Sudhkar Rao had said that the Boston police despite claiming to have clues had failed to arrest the killers.
Rao from Jeypore town and a student at the Boston University`s Graduate School of Management was shot in the head and leg by an unidentified person on April 20 and died of his injuries.