SP CB-CID, JK Shahi, yesterday recorded the statements of several police officials along with Prabha Tyagi, the mother of the slain gangster.
The SP also visited the spot inside the court premises where history-sheeter Tyagi was shot dead during a hearing on February 16, police said.
The assailant, Sagar Malik, was arrested on the spot while another accused, Brijbir, was nabbed later. Three police officials, namely Deputy SP (STF) Anuj Choudhry, SHO Sachin Malik and constable Vikas, too, have been named in the case.