What Briton played Lee Harvey Oswald in the film JFK, where Kevin Costner could also be seen?

Explanation

Gary Oldman (born 1958) is a British actor and film director. He is known for making his characters unique by changing his accent and tone of voice. Oldman had his break-through as the Sex Pistols bassist Sid Vicious in the film 'Sid and Nancy' (1986). He has also had roles in films such as 'Prick Up Your Ears' (1987), 'JFK' (1991), 'Immortal Beloved' (1994), 'Dracula' (1992), 'Léon' (1994), 'The Fifth Element' (1997), 'Air Force One '(1997) and 'Harry Potter and the Prisoner of Azkaban' (2004).