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.
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.
"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 with Naomi Watts, Ben, and Laura Dern in 2004. (Photo Credit: Getty Images)
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.
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!