Horrible case from Australia.
12 year old girl who was sexually abused by her foster brother (18 years old at the time). Tiahleigh told her foster mother about it and was then murdered by her foster father who feared that Tiahleigh was pregnant and so the abuse would become public.
The father, mother and two sons colluded to try to cover up the abuse and murder.
BBC link
She is the victim of sexual abuse. So she has to die before anyone finds out about it. A killing to protect the "family honour". And the family colluding to cover it up.
That poor girl never had a chance, living in a house with four different people who didn't even see her as human, far less part of what they saw as their family.