The murder of a nine-year-old boy by his sister, 12, has gripped the nation and left people asking: What turns a seemingly ordinary child into a killer?The girl with a kitchen knife three times in January in what appeared to be an unprovoked attack before waking up her mother and divulging in floods of tears what she had done.Doctors have warned that certain drugs or an undiagnosed personality disorder could drive a child to kill — with it now emerging that the girl had just come off an unnamed medication.
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