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Any thoughts on who the sperm donor could be for Kirsten? Could this be connected to the murder?

I’m seriously suspecting Dr Jeffrey Creston, the groom’s father, a gynaecologist - not too far-fetched to think he might have donated sperm…
This could be connected to the murder if Kirsten had managed to dig deep enough to discover who her donor-father was. Wouldn’t put it past her to blackmail Jeffrey for lots of money if he was the father.

I’m suspecting Dr. Creston too. I’m suspecting him for the murder too as she was probably extorting money from him.

Yes totally agree with both of you, that is totally my thinking.