Mom pleads not guilty to killing kids

• Story Highlights
• Mother pleads not guilty to killing her two children in Louisville, Kentucky
  
• Police say Gail Lynn Coontz briefly held a counselor hostage at U of L
  
• She's charged with killing 10-year-old daughter and 14-year-old son
  
• Police found the bodies after going to check on them after incident at university
  
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