On August 5, 1987, while driving a rented BMW 316 in Enniskillen, Northern Ireland, Broderick crossed into the wrong lane and collided head-on with a Volvo. The driver, Anna Gallagher, 28, and her mother, Margaret Doherty, 63, were both killed instantly. He was vacationing with Jennifer Grey, whom he had begun dating in semi-secrecy during the filming of "Ferris Bueller's Day Off"; the crash publicly revealed their relationship. He suffered a fractured leg and ribs, a concussion, and a collapsed lung. Grey's injuries included severe whiplash, which later required surgery to avoid paralysis.