Web Reference: Bernadette Protti is the teenage murderer who killed her schoolmate out of jealousy. She was born in 1969 in Orinda, California, United States, to Elaine Protti, while her father’s identity is scarce. Bernadette, portrayed in the film “Death of a Cheerleader,” brutally murdered her schoolmate Kirsten Costas, a case that gained notoriety for its chilling nature. The documentary likely delves into the events leading to the crime, Bernadette’s confession, and the subsequent legal proceedings. As of 2023, there is no information suggesting that Bernadette Protti, the convicted killer of Kirsten Marina Costas, has died. Bernadette Protti was found guilty of second-degree murder in the 1984 case that shocked the community of Orinda, California.
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Details: $29M - $62M
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Last Updated: April 3, 2026
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