In a letter to the President, the Prime Minister, Union Home Minister,Karnataka Governor and the Chief Minister, they said the state government should show its resolve in favour of democratic principles by nabbing those behind the killing and taking action against them as per law.
The signatories include literary figures, scholars and rationalists like Chandrashekar Patil, Narendra Nayak, Panditaradhya, Hema Pattanashetty, Vasanta Shetty and Sushi Kadanakuppe.
Kalburgi, 77-year-old rationalistfell to the bullets of two unidentified men at his residenceat Dharwad in north Karnataka, considered the state's culturalcapital, in August last year.
Alleging that CID, investigating the case, had not placed any facts in front of the public, they said "after the sketch of the suspects were released, we are not aware as to where the investigations have reached."
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Citing slow phase of the investigation, the letter expressed apprehensions that Kalburgi case will facesimilar consequences to that of Dabholkar and Pansare ofMaharashtra.
Anti-superstition crusader Dabholkar was shot dead in Pune on August 20, 2013, while Pansare, a prominent anti-toll activist and rationalist, was shot-at in Kolhapur on February 16 last year. He died in Mumbai four days later.
Investigators are also looking for links between the murders of Kalburgi, Dabholkar and Pansare.
They said it would also indirectly indicate curtailing freedom of thinking and free sharing ideology and also silence voice against fundamentalism.