June Lockhart, a popular actress of the 1950s and ’60s known for her roles in “Lost In Space,” “Lassie,” and “Meet Me in St. Louis,” died of natural causes on Oct. 23 in Santa Monica, Calif. She was 100.

June Lock­hart, a pop­u­lar actress of the 1950s and ’60s known for her roles in “Lost In Space,” “Lassie” and “Meet Me in St. Louis,” died of nat­ur­al caus­es on Oct. 23 in San­ta Mon­i­ca, Calif. She was 100.

Lock­hart became known for her per­for­mances as Timmy’s fos­ter moth­er, Ruth Mar­tin, on the CBS series “Lassie” from 1958 to 1964. She took over from Cloris Leach­man as the Mar­tin fam­i­ly moved on to the famous collie’s farm and became fos­ter par­ents to both the orphaned Tim­my and Lassie.

She then starred as Dr. Mau­reen Robin­son on the CBS series “Lost in Space” from 1965 to 1968. She played a bril­liant bio­chemist and lov­ing moth­er of three who is marooned in space along with her fam­i­ly. 

“When I wasn’t shoot­ing Lassie, I became the mis­tress of Scrab­ble with my hair­dress­er and the crew,” she told Clos­er mag­a­zine in 2024. She also not­ed that “Lost in Space” was her favorite project. “It was so campy,” she said, “And I tru­ly enjoyed my rela­tion­ship with my space fam­i­ly.”

Over near­ly eight decades on screen, Lock­hart went on to appear in dozens of series and movies well into her 80s, with recur­ring roles on “Pet­ti­coat Junc­tion,” “Gen­er­al Hos­pi­tal” “Bev­er­ly Hills 90210,” and guest appear­ances on shows from “The Bev­er­ly Hill­bil­lies” to “Hap­py Days” to “Full House, “Roseanne” and “Gray’s Anato­my.”

The daugh­ter of actor Gene Lock­hart and actress Kath­leen Lock­hart, she was born in New York City in 1925. She made her fea­ture film debut at 13 years old, star­ring along­side both of her par­ents in Edwin L. Marin’s 1939 “A Christ­mas Car­ol,” where she played Belin­da Cratchit. After her break­out role, she appeared in films such as “All This, and Heav­en Too,” “Meet Me in St. Louis,” “The Year­ling,” and “Sergeant York.”

Pri­or to the TV series, Lock­hart appeared in the fea­ture “Son of Lassie” as Priscil­la, the Duke of Rudling’s grand­daugh­ter. In the 1950s, Lock­hart guest-starred in sev­er­al West­ern series such as “Wag­on Train,” “Cimar­ron City,” “Gun­smoke,” “Have Gun – Will Trav­el,” and “Rawhide.”

She was nom­i­nat­ed for two Emmys, includ­ing Best Actress in a Lead­ing Role in a Dra­mat­ic Series for her per­for­mance in “Lassie.” She also received two stars on the Hol­ly­wood Walk of Fame, one for motion pic­tures and one for tele­vi­sion. Lock­hart was pre­vi­ous­ly the recip­i­ent of a Spe­cial Tony Award for Out­stand­ing Per­for­mance by a New­com­er for her role on Broad­way in “For Love or Mon­ey” in 1948.