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'Once Upon a time in Hollywood': The true story behind the Tate murders and how they tie into Tarantino's ninth film

The murders were carried out by members of the Manson Family on August 9, 1969, and claimed the lives of five people including an eight-month-pregnant Sharon Tate

Quentin Tarantino's 9th film, 'Once Upon a Time in Hollywood' is not based on a true story, but is set in the backdrop of one. The film starring Leonardo DiCaprio, Brad Pitt, Al Pacino, and Margot Robbie in lead roles is about an actor Rick Dalton (DiCaprio) who goes out of favor after his successful TV show comes to an end. He, along with his body double Cliff Booth (Pitt) and his agent (Al Pacino), tries to get back into the graces of those who held all the power in the golden era of Hollywood in the 1960s. Actor Sharon Tate (Robbie) is Dalton's neighbor and, somehow, her murder in 1969, becomes a central part of the plot.