June Lockhart, right, who played the character of Ruth Martin, mother of Timmy Martin, played by Jon Provost, left, during the classic series "Lassie," poses for a photograph with Lassie, 9th generation,

June Lockhart, who became famous in the 1950s and '60s for her starring roles in 'Lassie' and 'Lost in Space,' has died at 100.

June Lockhart, iconic Lost in Space and Lassie star, died at age 100 after remarkable career spanning TV, film and NASA advocacy.

June Lockhart, the actress known for Lassie, Lost in Space and Meet Me in St. Louis, has died. She was 100. The Tony-winning actress from the Golden Age of Hollywood died Thursday night of natural causes at her Santa Monica home with daughter June Elizabeth and granddaughter Christianna by her side.

The Tony Award-winning star’s career spanned eight decades, and included roles in Petticoat Junction, Happy Days, and Grey’s Anatomy

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. Lockhart died Thursday of natural causes at her home in Santa Monica,

Lockhart’s long career began in Hollywood’s Golden Age with such films as “A Christmas Carol” and “Meet Me in St. Louis.”

June Lockhart, the “TV mom” known to millions as the kindly figure on Lassie and Lost in Space, has died at her home in Santa Monica. She was 100 years old. Her death was announced by a spokesman, Harlan Boll.