June Lockhart, the celebrated actress renowned for her iconic roles in television series such as *Lassie* and *Lost in Space*, has passed away at the age of 100. The veteran performer died peacefully of natural causes at her Santa Monica residence on Thursday, as confirmed by a family spokesperson. Lockhart’s illustrious career spanned decades, leaving an indelible mark on both stage and screen. Born on June 25, 1925, in New York City, she made her cinematic debut at just 13 years old in the 1938 film *A Christmas Carol*, sharing the screen with her parents, esteemed actors Kathleen and Gene Lockhart. Her Broadway breakthrough came in the 1940s with her ‘enchanting’ performance in *For Love or Money*, earning her a Tony Award, a Donaldson Award, and the Associated Press citation for Woman of the Year for Drama. Lockhart’s portrayal of Ruth Martin in *Lassie* during the late 1950s and 1960s solidified her status as a household name, garnering her an Emmy nomination. She further captivated audiences as the nurturing mother in the science-fiction classic *Lost in Space* from 1965 to 1968. Even in her later years, Lockhart remained active, lending her voice to a 2021 Netflix remake of *Lost in Space*. A lifelong enthusiast of current events, she remained engaged with the world, reading the *New York Times* and *LA Times* daily until her final days. She is survived by her two daughters, including Anne Lockhart, who followed in her mother’s footsteps as an actress.