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June Lockhart, the gentle presence who anchored Lassie and later roamed the cosmos in Lost in Space, died Thursday at her Santa Monica home. She was 100, her spokesman Harlan Boll said. Replacing Cloris Leachman on Lassie in 1958, she spent six years as Ruth Martin before joining Lost in Space in 1965, a series that became a camp favorite. A performer since childhood—she debuted in A Christmas Carol at 13—Lockhart’s long career spanned Petticoat Junction, General Hospital, and a voice role in Netflix’s reboot. She is survived by a daughter and a granddaughter.

Prepared by Emily Rhodes and reviewed by editorial team.