Queen Camilla issued a heartfelt statement on the tearful turning point that prompted her to campaign for domestic abuse awareness.
Her Majesty was joined by Diana Parkes, whose daughter Joanna Simpson was killed by her estranged husband in 2010, in her new ITV documentary Her Majesty The Queen: Behind Closed Doors.
The pair first met at a SafeLives' Survivors Meeting in 2016.
"I tried to put myself in your shoes and thought to myself, What if it had been my daughter?" Camilla told Parkes.
"My reaction, I'm afraid, was to cry."