the milat is serving seven consecutive life sentences for the murders of seven backpackers in nsw between 1989 and 1992 .
in the letters , he tells shipsey about his ` fair share ' of ` sheilas ' , who write ` some frightening things ' - and one woman who has even proposed .
` every month someone new writes ; the latest one was from texas .
he has been locked up in goulburn 's supermax jail for almost 20 years .