Instead of rushing to Victoria with the information, Frank pays another woman a visit; Amanda Clarke
As a teenager she was locked up in a juvenile detention center and shared a cell with a girl named Emily Thorne. At first they hated each other, but these two eventually became friends. After they were both released, Amanda had a proposition for Emily; Amanda would pay Emily to completely switch identities with her. Amanda, being a good friend and in need of some cash, took the deal.
Frank, armed with his newly acquired knowledge, decided to fill Amanda in on the whereabouts of her old friend and what she had been up to.
While he was making a call to Victoria about the evidence he found, Amanda hit him over the head with a tire iron and killed him.