WATCH: First trailer for Heath Ledger doco

He died at a tragically young age, but fans will be given a glimpse into Heath Ledger's life in a new documentary.

A new trailer for I Am Heath Ledger dropped on Tuesday, a day after what would have been Heath's 38th birthday, with behind-the-scenes footage shot by the actor himself.

The new trailer for I am Heath Ledger dropped on Tuesday. Source: Spike

The never-seen-before footage will feature throughout the the 90-minute film, which also includes interviews with close friends, family and Hollywood colleagues, like ex-girlfriend Naomi Watts, actors Ben Mendelsohn and Emile Hirsch, musician Ben Harper, and director Ang Lee.

Filmmaker Matt Amatu says that the father-of-one "wanted fame and when he got it, didn't want it anymore" while childhood friend Trevor DiCarlo adds the star was "always a director. Acting was just a way to get there."

The doco will give fans an insight to the actor's life. Source: Spike

It features never-seen-before footage of the late star. Source: Spike

Meanwhile Bloodline star Ben Mendelsohn speaks of Heath's role in Brokeback Mountain, saying it changed his career forever.

"Before Brokeback Mountain came in, it would have been unthinkable to have a romantic tragedy involving two gay cowboys," he says in the trailer.

"This is one of the biggest heartthrobs on earth taking on that character. That's an artist."

The documentary will also give a behind-the-scenes look at Heath preparing for his role as The Joker for The Dark Knight, a role that earned him a posthumous Oscar.

Heath died in January 2008 at age 28 of cardiac arrest.

Heath's standout role in Brokeback Mountain "changed his career". Source: Spike

Heath personally shoot the footage shown. Source: Spike

RELATED: 'I miss him': Michelle talks life without Heath

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He left behind three-year-old daughter Matilda who he welcomed with former partner, actress Michelle Williams, in 2005.

I Am Heath Ledger will first debut at the Tribeca Film Festival on April 23 before premiering on Spike TV on May 17.

You can see all the behind-the-scenes footage of Heath in the trailer above.

Heath and former partner Michelle. Source: Getty Images.

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