Sardar Sooran Singh, the Special Assistant to Chief Minister Khyber Pakhtunkhwa, was assassinated in Pir Baba area of Buner district.
The Pakistani Taliban on Saturday responsibility for the assasination of a prominent Sikh politician who was shot dead by motorcycle-borne gunmen near his home in Pakistan's restive northwest.
Parrikar had compared the neigbouring country to "hell" and asserted that it should stop human rights violations in Balochistan.
Chawla, who is the general secretary of Pakistan Sikh Gurdwara Prabandhak Committee and is known to speak for 'Khalistan', had shared the purported picture on his Facebook page.
Khalistani separatist Chawla, a close aide of terrorist Hafiz Saeed, is part of the committee, which was not acceptable to India.