Suzanne Pleshette dies at 70

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• Cello-voiced beauty best known as wife on "The Bob Newhart Show"
  
• She also had career on stage and in films, including "The Birds"
  
• Actress was married to teen idol Troy Donahue, comic actor Tom Poston
  
• Cause of death was respiratory failure; she was treated for cancer in 2006
  
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