June Lockhart, the actress who became a beloved television mother figure in series like Lassie and Lost in Space, has died at the age of 100. She passed away on October 23, 2025, at her home in Santa Monica, California. Her family reported she died of natural causes.

Born in New York City in 1925 to actors Gene and Kathleen Lockhart, she began performing on stage at age eight and made her film debut by 1938 in A Christmas Carol. She garnered acclaim early in her career, including a special Tony Award in 1948 for her work on Broadway. On television, her best-known roles included Ruth Martin in Lassie and Maureen Robinson in Lost in Space, roles that earned her Emmy nominations and a lasting place in popular culture.

Throughout her long career, Lockhart remained active and engaged with her audience and the industry. Her legacy is not only in the characters she portrayed, but in the generations she inspired by taking on roles that combined warmth, wit, and authority. She is survived by her children and the many fans who will continue to celebrate her life and work.