being the strangler. police never proved it. a half century later, they may have cracked the case. >> they authorized getting his remains to proof his guilt once and for all. >> reporter: guilt at least in the case of mary sullivan, the final victim. the 19-year-old was raped and strangled. there were ten other victims between 1962 and '64 terrorizing the boston area grabbing international headlines and the silver screen. he was sentenced to life for unrelated crimes and stabbed to death in prison. thanks to new technology, authorities say they have matched dna from one of the strangler's relatives to dna preserved 49 years ago from the crime scene and victim mary sullivan. detectives tail the relative to