In 1977, in the aftermath of the election of the separatist Parti Québécois government in 1976, he was asked to sit on the CBA Committee on the Constitution.

[citation needed] Ghiz supported the Meech Lake Accord and opposed the Canada–United States Free Trade Agreement.

Following his decision to leave politics, Ghiz served as dean of his alma mater, the Dalhousie Law School until 1995, when he was appointed as a justice to the Supreme Court of Prince Edward Island.

Several weeks before his death, he was driven by construction personnel across the largest completed section of the Confederation Bridge which had yet to be connected to the North American mainland.

His son Robert, served as the 31st premier of Prince Edward Island from June 12, 2007 to February 23, 2015 (leader of the PEI Liberal Party, 2003–2015).