Suspect in the kidnapping of Minnesota socialite killed his estranged wife, her lover and his own son 4 years later

Following the 1972 kidnapping of Virginia 'Ginny' Piper of Orono, Minn., the FBI interviewed an estimated 1,000 people. One of the suspects at the top of the list was a man on the verge of committing a mass murder. Here is Part 2 in 'The 'Perfect' Kidnapping of Virginia Piper.' 
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