The day before a teenager killed a 10-year-old on a rural property, she suggested playing "serial killers" and chased the young girl with a knife.
Hours before the 14-year-old killed Biddy Porter on a NSW farm early on July 8, 2020, she texted a friend to say she "felt crazy" and was thinking about killing someone.
"It doesn't matter how many times I tell mum or dad I want to kill someone ... they think I'm joking," the distressed teenager said in a text to a friend late on July 7.
