Grab some tissues! Before his death, Heath Ledger asked his longtime friend Ben Harper to write a lullaby for his daughter Matilda — and it will definitely bring a tear to your eye.

Ben is just one of celebs featured in the upcoming documentary I Am Heath that looks back at the Oscar-winning actor’s life, career, and untimely death.

MORE: See the Cast of ’10 Things I Hate About You’ Today!

Told from the perspective of a father, Ben captured the love between Heath and his little girl in his song “Happy Ever After In Your Eyes” before Heath died suddenly from an accidental drug overdose.

“Couldn’t leave you to go to heaven / I carry you in my smile /For the first time my true reflection I see / Happy ever after in your eyes,” Ben sings in the sweet tune, seemingly predicting Heath’s time with his daughter would be cut short.

In 2012, Ben recounted how he was asked to write Matilda a lullaby after Heath gifted him with a piano.

MORE: Paris Jackson, Matilda Ledger and More Celebrity Kids Whose Parents Died Young

“Two days later, once the piano was in, he was like, ‘you got that piano right? I got a baby coming in about a month, I’m going to need you to write her a lullaby'” Ben told a crowd on stage in Australia. “So, this next song, I don’t play and I haven’t played much at all because I haven’t been able to play because when you do… but I’m just starting to come around.”

heath ledger ben harper getty

Heath with Naomi Watts, Ben, and Laura Dern in 2004.

Matilda, who is 11 years old today, will reportedly watch the documentary about her late father after her mom Michelle Williams gave executive producer Matt Amato her seal of approval.

“Michelle said, ‘We should do something now. Matilda is curious’,” Matt told Women’s Day.

MORE: 9 Inspiring Heath Ledger Quotes to Live by — Plus His Heartbreaking Final Words!

As for Ben, he still remembers Heath as the “majestic and regal human being” he was.

“Heath was the most alive human and if it wasn’t on the edge it didn’t interest him,” Ben added in the trailer for the documentary.

I Am Heath premieres on Spike TV on May 17 at 10 p.m. EST. WATCH: Look back at Heath’s life and career in the video below!