The murder of Sister Maria Laura Mainetti took place on 6 June 2000 in Chiavenna, Sondrio, Italy.
Mainetti, a 60-year-old Catholic sister and Daughter of the Holy Cross, was lured out of her convent and stabbed to death in a satanic sacrifice by three teenage girls.
The perpetrators received prison sentences ranging from eight years and six months to twelve years and four months.
Mainetti's death was declared a martyrdom by the Congregation for the Causes of Saints.
She has been recognised as a Servant of God since the initiation of her beatification process.