Pencils out class! Be prepared to show your work with some more complicated criminal relationship geometry in this classic Dateline episode DEADLY TRIANGLE. Good natured surfer Archie is murdered in cold blood in his driveway. There is one clear suspect with some serious dirty laundry in the trunk of his VW Bug. So why does it take 25 years to solve this case? Kimberly and Katie may be in the DARK about that, but Keith Morrison is on the scene in Southern California with his good prosecutor and forensic pals to get into the 3 sides of this story. After so much time will it all come down to a loverboy and his suspiciously dirty big boy pants? Find out in this very special installment of A DATE WITH DATELINE: Isosceles What You Did There

Official Description from PEACOCK TV: Detectives reopen a case involving the murder of a man who was part of a love triangle. Keith Morrison reports.

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