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>> reporter: in police work, a good tip can make your day and also make your life a lot more complicated. just such a tip came to the desk of the detective working the kathleen peterson case. >> i think it was two or three days after kathleens death is when i first had contact witum the familyembers of elizabeth ratliff. >> reporter: and just who was elizabeth ratliff? to answer that question we have to turn the clock back almost twenty years in michael petersons life and go across the atlantic ...