Police had interrogated many suspects in this case, and finally zeroed in on four persons -- Pratap Singh (37), Vinod Kumar (24), Sanklap Goel (19) and Mita Ram (22).
During the course of investigation, the four confessed to their crime, police claimed.
Police have recovered the pistol used in the crime from the native place of Pratap Singh, and live cartridge recovered from the pistol matches the cartridge recovered from the residence of the deceased.