LOS ANGELES — June Lockhart, who became a mother figure for a generation of television viewers whether at home in “Lassie” or up in the stratosphere in “Lost in Space,” has died. She was 100.

Lockhart died Thursday of natural causes at her home in Santa Monica, Calif., family spokesman Lyle Gregory, a friend of 40 years, said Saturday.

“She was very happy up until the very end, reading the New York Times and L.A. Times every day,” he said. “It was very important to her to stay focused on the news of the day.”

The daughter of prolific character actor Gene Lockhart, June Lockhart was cast frequently in ingenue roles as a young film actor. Television made her a star.

From 1958 to 1964, she portrayed Ruth Martin, who raised the orphaned Timmy (Jon Provost), in the popular CBS series “Lassi

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