You're right, it was 1986 (the same year I turned 17, like the girl who got away). They are very well known here. In fact, we own a book called Couples Who Kill (published in the US) and they appear in that, plus Steve Liebman's Crime Infestigation Australia has profiled them in the past, so there is a general awareness of them even overseas.
Having watched it - a combination of infestation and investigation sounds about right. BTW there's another documentary on them this coming Wednesday on 7 - Beyond the Darklands (oooh, scary!)
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