Chilling video shows two young Texas sisters charged with fatally hacking a mother of five to death flashing sickening smiles as police hauled them off in handcuffs. 19-year-old Amaya Cookie Diaz and 21-year old Kitty Mia Diaz, 21, were taken into custody just after 4 p.m on June 25th, hours after cops say they repeatedly stabbed 32-year-old Caroline Peña in broad daylight. A third suspect, Kyandra Renee Faz, was also arrested in the shocking murder that took place in Del Rio, Texas, a small city near the Mexican border.