Jail officials said call detail records point to drug kingpin Sharafat Sheikh and two jail wardens.
Amolkar (40) was found hanging from the grill of a vent in the toilet.
Former Delhi university law faculty dean to be included in consultations.
The statue built by convicted prisoner Ram Chander was inaugurated on January 27 by Mehra.
An inspector of Govindpuri police station had moved an applicationsaying he had a suicidal tendency.
Sher Singh Rana’s counsel Mukesh Kalia, however, said police had failed to prove motive behind the murder.
In a small adjoining room, there are three beds for Roy and two associates who have also been jailed.
Investigators said the conspiracy hatched by Rana to kill Phoolan was well-planned.
Why convict only me, asks Rana; challenge it in the High Court, says ASJ Bharat Parashar
The Delhi Police alleges that Bhatkal and Akhtar, along with other co-accused, had set up an arms manufacturing factory in Nangloi.
On Tuesday, the Home Department removed Sunil Gupta, the Tihar Prisons public relations officer, from the post.
The court had on July 25 asked the Delhi government to explore a venue within Tihar jail complex where Roy can hold negotiations with buyers.
Bhatkal had alleged that he is presently lodged in Jail No.2 of Tihar and has not seen sunlight except when he was taken to the court.
Under the new initiative, a restaurant has been set up on Jail Road, where inmates trained in hotel management will serve customers.
The restaurant is open from 10:00 AM to 10:00 PM. It will also deliver food in areas falling within a radius of one km.