The petitioner demanded an impartial CBI inquiry into the matter because he had apprehensions that a police-underworld nexus could impede the process of investigation.
The Bombay High Court has now given the police until 21 June to submit a report on progress in the probe.
Another PIL filed by social activist Ketan Tirodkar has also been clubbed with this petition and a lawyer representing the journalists' association has also been allowed to intervene in the matter.
Dey was shot dead on 11 June in daylight near Powai in Mumbai by unidentified motorcyclists. Journalists responded with demands to introduce a new law making attacks on journalists a 'non-bailable offence' and for an impartial probe.
Union law minister Veerappa Moily admitted that journalists should be given a sense of security and asked the legislative department of the law and justice ministry to draft a new bill to protect journalists, reported the Indian Express.
The police are reportedly exploring connections to the killing, including the sandalwood, real estate or oil mafia, because Dey had been said to be reporting a story that would expose an organised crime syndicate.
Allegations about police officers being involved in the journalist’s murder have also surfaced. The police responded by transferring an assistant commissioner of police (ACP).