Mary Katherine Schmitz (formerly Letourneau; January 30, 1962 – July 6, 2020) was an American schoolteacher. She pleaded guilty in 1997 to two counts of felony second-degree rape of a child. The victim was Vili Fualaau, who was 12 or 13 at the time and had been her sixth-grade student. She was born in Tustin, California.