Pakistan's former prime minister Imran Khan on Monday demanded a "proper inquiry" into the death of a Sub-Inspector, the complainant and a crucial witness in the assassination attempt on him in Punjab province in November last year.

Khan, the chairman of the Pakistan Tehreek-e-Insaf (PTI), suffered bullet injuries in the right leg on November 3 when gunmen fired a volley of bullets at him and others standing on a container-mounted truck in the Wazirabad area, some 150 km from Lahore, where he was leading a 'Long March' to Islamabad press for snap polls.