Chaudhry Zulfikar, the lead prosecutor, investigating the 2007 assassination of former Pakistani Prime Minister Benazir Bhutto, has been shot dead while leaving his home.
Mr Zulfikar was gunned down as he drove to court in the capital Islamabad, a female passerby was also killed during the attack, police said.
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Trinity Mirror's new national daily will publish its final edition on Friday 6 May.