Those named in the charge sheet are Ajay Pal, Vijay Pal and Rakesh Pal, who had land dispute with Nanhe Yadav, Sanjay Pratap Singh alias Guddu Singh and his brother Rajiv Pratap Singh alias Raju Singh.
Sanjay Pratap Singh was the driver of former Uttar Pradesh minister Raghuraj Pratap Singh alias Raja Bhaiya. The politician was also questioned by the CBI for allegedly providing shelter to his driver.
On March 2 evening, Nanhe Yadav was shot dead at Balipur village near his house and his death sparked a chain of events which led to the killing of his younger brother Suresh Yadav and DSP Zia-ul Haq.
This is one of the four cases being registered by the CBI to probe the murders of Yadav, Haq and the violence in the area.
Praveen Azad, wife of the slain DSP, had named Raja Bhaiya's drivers Guddu Singh and Rohit Singh, Kunda zila panchayat chairman Gulshan Yadav and Raja Bhaiya's local representative Hariom Srivastava for beating and killing her husband.
However, the allegations could not be verified during investigation and the CBI arrested the pradhan's son and his brothers Phoolchand and Pawan and an associate, Manjit Yadav, for killing Haq.