Rebecca Marie Watts (3 June 1998 – 19 February 2015) was a British student from Bristol who was murdered in 2015 at the age of 16. In November 2015, her step-brother, Nathan Matthews, was found guilty of her murder and was sentenced to life in prison with eligibility for parole after 33 years. His girlfriend, Shauna Hoare, was found guilty of manslaughter and sentenced to 17 years in prison, although Hoare had insisted to police that she had nothing to do with the killing, or dismembering Watts' body and hiding the parts.
https://en.wikipedia.org/wiki/Murder_of_Becky_Watts