Expert: Man Googled 'how to kill'

• Story Highlights
• Expert says "How to kill with a knife" search done four days before murders
  
• Neil Entwistle is accused of killing his wife and 9-month-old daughter
  
• Chemist testifies Entwistle's DNA found on .22-caliber handgun used in shootings
  
• Expert expected to testify more about Entwistle's computer use Wednesday
  
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