Homicide Investigation Unfolds

The NYPD told the New York Times investigators are looking into the possibility the gunman who killed UnitedHealthcare CEO Brian Thompson may have used what is known as a veterinary gun, a larger firearm used on farms and ranches. Also Friday, a backpack believed to belong to the suspect was found in Central Park, a law enforcement official told CNN. Plus, the race to identify the UnitedHealthcare CEO shooter is hardly the first time a manhunt captivated the nation's attention. What can high-profile investigations into the Boston Marathon bombing and DC Sniper tell us about how the current search might end? CNN's Brian Todd takes a look. 

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