Gerarda Alida (Atie) Ridder-Visser (23 July 1914 – 20 August 2014) was a Dutch resistance fighter during World War II.
After the war, Visser worked in Leiden at the Political Investigation Service (POD) with former gang chief Dick Spoor, who oversaw the group after the death of Post in 1944.
[clarification needed] In 1947, Visser immigrated to the Dutch East Indies, where she met and married Herman Ridder.
A few years later, the couple returned to the Netherlands and lived in Rotterdam and Hengelo.
In early 2011, Ridder-Visser wrote a letter to Mayor Lenferink of Leiden, where she confessed to murdering Guljé .