The A Knight's Tale actor tragically passed away from an accidental prescription drugs overdose in 2008 aged 28, and the star's life is set to be explored in the upcoming project, which left his sister Kate in floods of tears after watching just a short clip.
She told The Project: "I think I screamed and cried through the whole first viewing."
![Heath and his sister Kate attend a premiere. Photo / Getty](https://www.nzherald.co.nz/resizer/v2/IDRK4Z7POOVI3W5Y6KDBAH4SEI.jpg?auth=f4273f13ecbd716492d8d7d0a324f69d545db1f71ec0654045f3855fd9f7b1a9&width=16&height=11&quality=70&smart=true)
But Kate believes the show will prove to be a "cathartic experience" for her, as well as Heath's former partner Michelle Williams and the one-time couple's 11-year-old daughter Matilda.
She said: "It's quite a cathartic experience, I think, especially for our family."