Newly found DNA could shed light on "Monster of Florence" serial killer case decades after mysterious murders of couples

Newly discovered DNA could shed light on one of Italy's most famous cold cases, finally revealing the "Monster of Florence" serial killer who murdered young couples in the 1970s and 80s.

More than half a century since the first shocking murders sowed terror in Tuscany, doubt over the murderer or murderers continues to cloud the case, even though three different men have been convicted and sent to prison over the years for some of the 14 or more murders.

But some are still unaccounted for and many questions remain.