What happen to john curtis on the waltons?

In "The Waltons," John Curtis is the son of Mary Ellen Walton and her husband, John Curtis. He is born in Season 7, and his character represents a significant moment in Mary Ellen's life as she navigates motherhood. The character grows throughout the series, showcasing the challenges and joys of family life during the Great Depression and World War II era. His presence also highlights the evolving dynamics within the Walton family.