Reiterating that execution of Zulfikar Ali Butto was 'judicial murder, Prime Minister Syed Yousuf Raza Gilani has said his government was reviewing reopening of the case, report said on Saturday. I have mentioned in my book that it was a judicial killing. We are reviewing reopening of the case, Gilani said while talking to newsmen after visiting ZABs mausoleum on the eve of 31st Death Anniversary of PPP founder. He said PPP government was restoring the 1973 Constitution, given by ZA Bhutto, 'in its letter and spirit in collaboration with all political parties. Gilani said democratic institutions would get strength and the country would move to development with approval of the proposed 18th Amendment in the Constitution.