The huge amount of blood at the crime scene spoke of the violence of the attack; investigators describe it as "overkill," and it's usually an indication that the victim knew the attacker. Police hoped that, during the struggle, the killer had left some of his own blood - and his DNA - behind. Their challenge was to find it.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices Hosted on Acast. See acast.com/privacy for more information.

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