The Lassie and Lost in Space star, who died on Thursday, Oct. 23 of natural causes at age 100, is being remembered online by two of her former TV sons, Jon Provost and Bill Mumy.

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.

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.Related video above: ...