Prognosis for craniopagus parasiticus is generally poor. As of 2007, only three cases are known to have survived childbirth. Everard Home described the first and longest-lived of these, the "Two-Headed Boy of Bengal", who survived until bitten by a cobra in 1787, at the age of four.
Live like that and then die bye the teeth of a cobra, thats what i call a sad story. More info Here