June Lockhart, affectionately known as Lassie’s mom to a generation of Baby Boomers for her portrayal of Ruth Martin on the long-running series, has died. She was 100.

Lockhart, famous for playing other nurturing characters on two other CBS shows in the 1960s — the matriarch on the sci-fi drama Lost in Space and the “lady doctor” on the rural sitcom Petticoat Junction — died Thursday of natural causes in Santa Monica, a family spokesperson announced.

Her father was the great character actor Gene Lockhart — he received an Oscar nomination in 1939 for Algiers and appeared in such classics as His Girl Friday , Abe Lincoln in Illinois , Meet John Doe and Miracle on 34th Street — and her mother was actress Kathleen Lockhart ( Lady in the Lake ).

June Lockhart, affecti

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