"Unless the Delhi Police interrogates Tanwar, the reality of this case will never come to light since late Mr Khan had turned down the bribe offer made to him.
"This is bringing further disgrace to his position of NDMC vice-chairman. It has now come to light that Mr Tanwar tried to undermine the Delhi Cantonment Board and illegally interfered in its functioning," the delegation led by AAP's Delhi unit convenor Dilip Pandey said in the memorandum to Jung.
Khan was shot dead on May 16, a day before he was scheduled to pass the final order on the lease terms of hotel 'The Connaught' which was functioning on a property leased by the civic body. Police last week arrested the owner of hotel, Ramesh Kakkar, and five others in connection with the murder.
The AAP also alleged that the Delhi Cantonment Board has accused Tanwar of "provoking religious sentiments and disturbing peace."
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The party also sought to drag East Delhi BJP MP Maheish Girri into the controversy and alleged that he had also written a letter against the Khan.
"I demand that your goodself direct the Delhi Police to arrest and question both Mr Tanwar and Girri to bring out the reality of this case," the memorandum said.
Girri denied writing any letter in this regard and asked AAP to produce the letter.
The party had earlier alleged that Tanwar had threatened Khan with dire consequences, a few days before his murder and demanded the Delhi Police arrest him and probe his "complicity" with the murderers. It also said that Tanwar had written a letter to LG seeking action against Khan.