LOS ANGELES (AP) — June Lockhart, a beloved figure for many television enthusiasts, who graced the screens as a nurturing mother in the iconic series “Lassie” and embarked on cosmic adventures in “Lost in Space,” has passed away at the age of 100.

Lockhart’s peaceful passing occurred on Thursday at her residence in Santa Monica due to natural causes, as confirmed by Lyle Gregory, a close family friend and spokesperson for over four decades.

“She maintained her happiness right until the end,” Gregory shared, reflecting on her serene final days.

Born to the esteemed character actor Gene Lockhart, June Lockhart initially found herself cast in numerous ingenue roles during her early film career. However, it was the realm of television that truly catapulted her to stardom.

From 1958 to 1964, Lockhart captured hearts as Ruth Martin, the caring guardian of the orphaned Timmy, portrayed by Jon Provost, in the cherished CBS series “Lassie.” Her journey continued from 1965 to 1968 aboard the Jupiter II, where she took on the role of the Robinson family matriarch in the whimsical CBS adventure series “Lost in Space.”

Lockhart’s portrayal of kind and loving mothers resonated deeply with young audiences, cementing her status as a cherished television icon. As the years passed, baby boomers, eager to relive their childhood memories, eagerly attended nostalgia conventions to meet Lockhart and obtain her treasured autographed photographs.

Offscreen, Lockhart insisted, she was nothing like the women she portrayed.

“I must quote Dan Rather,” she said in a 1994 interview. “I can control my reputation, but not my image, because my image is how you see me.”

“I love rock ‘n’ roll and going to the concerts,” she said. “I have driven Army tanks and flown in hot air balloons. And I go plane-gliding — the ones with no motors. I do a lot of things that don’t go with my image.”

Early in her career, Lockhart appeared in numerous films. Among them: “All This, and Heaven Too,” “Adam Had Four Sons,” “Sergeant York,” “Miss Annie Rooney,” “Forever and a Day” and “Meet Me in St. Louis.”

She also made “Son of Lassie,” the 1945 sequel to “Lassie, Come Home,” playing the grown-up version of the role created by Elizabeth Taylor.

When her movie career as an adult faltered, Lockhart shifted to TV, appearing in live drama from New York and game and talk shows. She was the third actor to play the female lead in “Lassie,” following Jan Clayton and Cloris Leachman.

Lockhart spoke frankly about her canine co-star: “I worked with four Lassies. There was only one main Lassie at a time. Then there was a dog that did the running, a dog that did the fighting, and a dog that was a stand-in, because only humans can work 14 hours a day without needing a nap.”

“Lassie was not especially friendly with anybody,” she added. “Lassie was wholly concentrated on the trainers.”

After six years in the rural setting of “Lassie,” Lockhart moved to outer space, embarking on the role of Maureen Robinson, the wise, reassuring mother of a family that departs on a five-year flight to a faraway planet.

After their mission is sabotaged by a fellow passenger, the party bounces from planet to planet, encountering weird creatures and near-disasters that required viewers to tune in the following week to learn of the escape. Throughout the three-year run, Mrs. Robinson offered consolation and a slice of her “space pie.”

As with “Lassie,” Lockhart enjoyed working on “Lost in Space,” saying it was “like going to work at Disneyland every day.”

“So smart, quick, and funny — she filled her 100 years with curiosity, laughter, and rock ’n’ roll,” Angela Cartwright, who played her daughter on “Lost in Space” posted on Facebook. “I can only imagine she’s feeling right at home as she steps off this planet and into the stars.”

Bill Mumy, who played her son, posted on social media: “A one of a kind, talented, nurturing, adventurous, and non-compromising Lady. She did it her way. June will always be one of my very favorite moms.”

Lockhart remained active long after “Lost in Space,” appearing often in episodic television as well as in recurring roles in the daytime soap opera “General Hospital” and nighttime soaps, “Knots Landing” and “The Colbys.”

Her film credits included “The Remake” and the animated “Bongee Bear and the Kingdom of Rhythm,” for which she provided the voice for Mindy the Owl.

She also used her own media pass to attend presidential news conferences, narrated beauty pageants and holiday parades, and toured in the plays “Steel Magnolias,” “Bedroom Farce” and “Once More with Feeling.”

“Her true passion was journalism,” Gregory said. “She loved going to the White House briefing rooms.”

Lockhart liked to tell the story of how her parents met, saying they were hired separately for a touring production sponsored by inventor Thomas A. Edison and decided on marriage during a stop at Lake Louise, Alberta.

Their daughter was born June 25, 1925, in New York City. The family moved to Hollywood 10 years later, and Gene Lockhart worked steadily as a character actor, usually in avuncular roles, sometimes as a villain. His wife, Kathleen, often appeared with him.

Young June made her stage debut at 8, dancing in a children’s ballet at the Metropolitan Opera House. Her first film appearance was a small role in the 1938 “A Christmas Carol,” playing the daughter of Bob Cratchit and his wife, who were played by her parents.

She was married and divorced twice: to John Maloney, a physician, father of her daughters Anne Kathleen and June Elizabeth; and architect John C. Lindsay.

Originally Published: October 25, 2025 at 8:06 PM EDT