Bernadette Protti murder Kirsten Marina Costas on June 23, 1984. She did that out of resentment and envy. Protti was born in 1968 and was only 15-year-old when she murdered her classmate, Costas who was of the same age with her.
Protti was arrested on December 10, 1984 after she turned herself in.
Kirsten Marina Costas Death
15-year-old Kirsten Costas was murdered by Bernadette Protti in Orinda, Contra Costa County, California, USA.
She was stabbed to death with a kitchen knife by Protti who was later sentenced to nine (9) years on March 14, 1985. It was a homicide.
Seven (7) years later, Protti was released on parole, June 10, 1992.