The investigative agency filed the charge sheet in the special CBI court days before the 90-day mandatory period for filing its crucial probe report after the arrest of the accused was to be over.
On February 1, bike-borne assailants had gunned down Shravan outside his house in Sadatganj area here.
Shravan was pursuing a court case against Aqeel, a listed criminal from Thakurganj area. Aqeel had killed Shravan's son Ayush in October 2013 over a tiff at a beer bar in Thakurganj.
As name of the three city policemen, who allegedly supported Aqeel clandestinely, had cropped up in the entire episode, the high court directed CBI to take over the case.
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The agency took over the case in first week of April.
The charge sheet was filed against the shooters Satyam Chaudhary and Aman Singh under IPC sections 302 and 201, while Ajay Patel, Raju, Sonu and Aqeel were booked for criminal conspiracy and destruction of evidence.
The agency is expected to file the supplementary charge sheet against other accused in the coming weeks.