The new documentary I Am: Heath Ledger premieres tonight, so many fans of the late Heath Ledger are curious what really happened to the actor nearly 10 years after his death.

How did Heath Ledger die?

On January 22, 2008, Heath passed away from an accidental overdose of prescription drugs. He was 28 years old at the time. During an interview in the years following his death, his dad, Kim Ledger, got candid about his son dying at such a young age.

heath ledger getty images

"It was totally his fault. It was no one else’s. He reached for [the pills]. He put them in his system. You can’t blame anyone else in that situation. That’s hard to accept because I loved him so much and was so proud of him," he said. "Heath mixed a couple of drugs together with sleeping tablets and he’s gone forever. That’s something [my wife, Sally, Kate, and I] just have to deal with."

MORE: Find out Heath Ledger's Heartbreaking Last Words Before His Death

"His sister was on the phone with him the night before telling him not to take the prescription medications with the sleeping tablets," Kim continued. "He said, ‘Katie, Katie, I’m fine now. I know what I’m doing.' [Heath] would have had no idea."

Was Heath Ledger married?

Heath was not married at the time of his death, although he did leave behind a daughter, Matilda, who was just two years old at the time of her dad's passing. Heath welcomed his now-11-year-old girl with his ex-girlfriend Michelle Williams, whom he dated from 2004 until 2007 and welcomed Matilda with in October 2005.

When is I Am: Heath Ledger on?

I Am Heath Ledger is airing Wednesday, May 17, at 10 p.m. ET on Spike.

MUST SEE: Heath Ledger's Daughter Matila Is All Grown up Today — See Her Now!

What Is I Am: Heath Ledger about?

The documentary will feature home videos of the beloved Australian actor, behind-the-scenes footage from some of his biggest roles, as well as intimate interviews with those who were very close friends with the late star.

More From Closer Weekly

Jake Gyllenhaal Remembers 'Brokeback Mountain' Co-Star Heath Ledger

Michelle Williams Talks Selling the House She Shared With Heath Ledger — See What She Revealed

Michelle Williams Opens up About Raising Daughter Matilda Without Heath Ledger