June Lockhart , a popular actress of the 1950s and ’60s known for her roles in “ Lost In Space ,” “ Lassie ” and “Meet Me in St. Louis,” died of natural causes on Oct. 23 in Santa Monica, Calif. She was 100.

Lockhart became known for her performances as Timmy’s foster mother, Ruth Martin, on the CBS series “Lassie” from 1958 to 1964. She took over from Cloris Leachman as the Martin family moved on to the famous collie’s farm and became foster parents to both the orphaned Timmy and Lassie.

She then starred as Dr. Maureen Robinson on the CBS series “Lost in Space” from 1965 to 1968. She played a brilliant biochemist and loving mother of three who is marooned in space along with her family.

“When I wasn’t shooting Lassie, I became the mistress of Scrabble with my hairdresser and the c

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