An American architect of Northern Ireland’s historic peace accord has urged its feuding politicians to revive the mothballed Belfast government, as a current political crisis clouded celebration of the peacemaking milestone.

It has been 25 years since the striking of the Good Friday Agreement, the landmark peace accord that ended three decades of violence in Northern Ireland, a period known as “the Troubles.”.

NEW YORK Jean Kennedy Smith, the last surviving sibling of President John F. Kennedy and a former ambassador to Ireland, died Wednesday, her daughter confirmed to The New York Times. Smith died at her home in Manhattan, her daughter Kym told the Times. Sen. Edward Kennedy, the youngest of the Kennedy siblings, died of brain cancer in August 2009, the same month their sister Eunice Kennedy Shriver died. Smith, who married Kennedy family financial adviser and future White House chief of staff Stephen Edward Smith in 1956, was viewed for much of her life as a quiet sister who shunned the spotlight. Her son, Dr. William Kennedy Smith, made headlines in 1991, when he was charged with rape at the Kennedy estate in Palm Beach, Florida.