The actress wrote: "MISSING! This is my brother Christopher Cattrall or Chris as we call him. He has been missing since Tuesday, January the 30th from his home in Lacombe, Alberta Canada."
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Cattrall, whose known for her lead role in "Sex in the City," described her brother as "one of a kind." She said that he's 55-years-old, six feet tall, 200 pounds, with blue eyes and short brown hair.
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The actress also tweeted several messages on Twitter with details involving her brother's case.