London: Prominent barrister and writer of the 1973 constitution of Pakistan, Abdul Hafeez Pirzada, passed away at the age of 80 on Tuesday, Aaj News reported. <br />He was under medical treatment in London. He graduated from Karachi University and his name is mentioned among the pioneers of Pakistan Peoples Party. According to a local newspaper, he last represented Pakistan Tehreek-e-Insaf (PTI) in the judicial commission probing the May 2013 elections, had recently had a surgery on his intestine. That surgery resulted in medical complications leading to organ failure and ultimately his demise. <br />Pirzada was a barrister and a senior advocate of the Supreme Court. He was a third generation barrister from Lincoln’s Inn. He began practicing in the then West Pakistan High Court in 1957, joining the Chambers of Zulfikar Ali Bhutto.