The eyewitness, in the Vivek Tiwari murder case, on Tuesday revealed that Constable Prashant Chaudhary, shot the former from the front."We were returning home when 2 bike-borne police personnel- Prashant and Sandeep-came from front and Prashant shot at him. Bullet was fired from front. Few truck-drivers were present there but they didn't help," she told. Chaudhary, allegedly shot Tiwari after the latter refused to stop his car when asked by patrolling personnel.