Ampulla of Vater
Illuminator
The track record on child killers would suggest that if Burke is guilty, if he has gotten away clean, that we'll see some bad results out of him as an adult.
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If it was the Father and he is some kind of child killer pervert - same thing. That is not a one-shot deal: normal all your life then rape and kill your daughter and then normal again the rest of your life? That seems unlikely.
Except Dad is like 75 years old now, so I really don't think he is likely to do it again, at least at this point. (I'm not saying he did it to begin with).
Either way, it's been 2 decades since the crime and neither Burke nor Dad have done anything similar. Does this mean you don't think they were involved?