Actress June Lockhart, who played warm-hearted mom Ruth Martin on CBS' "Lassie" and space mom Maureen Robinson on "Lost in Space," which also aired on CBS, has died at 100, her family announced.

Lockhart died at age 100 at her Santa Monica, Calif., home, her family announced through spokesman Harlan Boll.

She was surrounded by her daughter June Elizabeth and her granddaughter, Christianna.