A diary compiled by Heath Ledger while working on The Dark Knight can been seen in a video that has surfaced online.
The footage appears to be a clip from an episode of the German documentary series Too Young to Die.
The diary contains pages of cut-out clippings and photos of Ledger in character, accompanied by handwritten notes.
The last page shows the words “bye bye” written across the page.
In the video, Ledger’s father, Kim Ledger, flicks through the pages of the diary while talking about his son’s work ethic.
Standing next to the diary is the gold Oscar statuette the actor posthumously won for his role as the Joker in the Batman film.
“You know he pretty well locked himself up in a hotel and he … galvanised the upcoming character. That was typical of Heath on any movie.
“He would immerse himself in the upcoming character …” Kim Ledger says in the video.
“The hospital scene is interesting because when he was a kid, his sister Kate liked to dress him up as a nurse.
“He was really funny like that. He also was in the movie.”
Other sources of inspiration include Stanley Kubrick’s The Clockwork Orange and hyenas.
Ledger was found dead in his New York apartment following a prescription drug overdose only months before the 2008 release of Christopher Nolan’s blockbuster film.