Expressing grief over the death of senior journalist J Dey, journalist organisations in Mumbai on Saturday alleged that exposure of the police-underworld nexus by the senior scribe could have led to the killing.

"We condemn the killing of J Dey. He tried to expose the police-underworld nexus and with those revelations, today he became a victim. The city is driven by the police and the underworld and no law and order exists here," said Prasad Mokashi, president of the Mumbai Marathi Patrakar Sangh.

"We demand the resignation of the police commissioner as he couldn't curb the crime rate in the city," Mokashi said.

"With the murder of J Dey, it has been proven that the police-underworld nexus exists in the city. He had put out several stories on Dawood Ibrahim, Chotta Rajan and others," said Shashikant Sandhbor, president of the Television Journalists Association.

"We demand that the home ministry should conduct a thorough investigation. Also, it should come up with a report on past cases where journalists have been attacked and the status of the probe," Sandhbor said.

"A proper investigation should be conducted into this dastardly murder. Crime reporters should be protected," said Aniket Joshi, president of the Mantralaya and Vidhi Mandal Varthahar Sangh.