Transcripts for CNN Forensic Files 20140707 07:15:00

while searching for the person responsible for the brutal axe attack, investigators first tried to uncover the motive. >> we don't have axe murderers here. it was just an alarming, tremendously alarming case. >> police learn that peter porco had a relative in organized crime who'd been in trouble with the law. >> the relative is frank porco, known as frankie "the fireman" porco. >> frankie was serving time in federal prison for loan sharking. there were rumors that frankie porco would provide state's evidence and information in return for a lighter sentence. >> it was what they call a signature killing, you know, that the mob would do, and it was a fireman's act because it was retaliation for frankie the fireman. frankie the fireman put doubt on this theory. >> he was in prison because he wasn't a snitch. and he had been made offers to cooperate with authorities to

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