Jessica Camilleri would call strangers and threaten to cut off their head before decapitating her mother Rita

Jessica loved numbers.

WARNING: This story contains graphic content that some readers may find upsetting.

Her favourites were two, three and five.

She liked repeating them to form a random phone number.

Then she would call and tell a stranger she was going to cut off their head.

One night in July last year, Jessica Camilleri lived out the threat of decapitation — on her mother, Rita.

Then 25, she stood bloodstained from head to toe on her Western Sydney street and confessed under torchlight.

“I killed my mum,” she told a police officer, motioning to her left.

“My mum’s head is over there.”

The conversation was captured by a body-worn camera and played in a NSW Supreme Court trial last week.