Prosecutors say Alexi Saenz and his brother hunted the best friends down and attacked them with machetes and baseball bats.
Brentwood Ross High School held a vigil Friday night for 15-year-old Nisa Mickens and her best friend, 16-year-old Kayla Cuevas.
There are strong indications that these murders were committed by members of a gang, authorities said, but why were they targeted?
The medical examiner later ruled Mickens' death a homicide, saying the cause of death was assault. She had at least 10 injuries to her head and face.
