According to Business Insider, Australian actor Damon Herriman has been cast as Charles Manson in Netflix's "Mindhunter" season 2. The Wrap reported this week that Herriman is also playing Manson in Quentin Tarantino's "Once Upon a Time in Hollywood." Mindhunter is set in the 1980s after Manson has already been locked away and follows two FBI agents who begin interviewing imprisoned murderers, which leads to the term "serial killer" being coined.