carole cole , 17 , disappeared in october 1970 after running away from a juvenile jail in texas .
her body was found in january 1981 outside shreveport , louisiana - but remained unidentified until this past february .
carol 's sister made craigslist posts across louisiana and texas .
at the same time , the bossier parish sheriff 's department created a facebook page for their ` jane doe ' body .
a 911 dispatcher saw the craigslist post and made the connection .
convicted murderer john chesson has been fingered as a suspect by his own daughter .