Tulsiram Prajapati was killed in an alleged staged shootout Dec 28, 2006 in which then minister of state for home Amit Shah is the main accused.
Prajapati was the only witness to the December 2005 police shootout in which Sohrabuddin Sheikh was killed.
"How can he stay as chief minister when the investigation process is going on. The senior leader of Bharatiya Janata Party, Narendra Modi, used his chair and intervened with the justice system," Congress general secretary Ajay Maken said at a press conference.
"There should be an inquiry into it and the Central Bureau of Investigation (CBI) should enquire about it," Maken said.
The issue came to light after a petition was filed by a journalist on the basis of a sting operation done by him.
He alleged that attempts were made by BJP MPs Prakash Javadekar and Bhupendra Singh Yadav to impede the trial and other judicial proceedings by manipulating the complainant with the sole intent to protect Shah.
The Congress also showed and distributed the CDs of the sting operation which caught Prakash Javadekar on record.
"It is not anybody but Prakash Javadekar who has been caught on the camera. The BJP has been now challenging the credential of the journalist who has done it," said Shaktisinh Gohil, Gujarat Congress leader.
"If they doubt the credentials then they can send the CDs to the forensic department, as they are the best judge," added Gohil.
The BJP dismissed all the allegations against Modi.
"We do not expect the Congress to do anything different than demanding resignation. They have tried to take on the man in the last three elections and every time the people of the state have rejected the Congress," BJP Rajya Sabha MP Balbir Punj said.
--IANS (Posted on 03-09-2013)