David Bowie's death struck millions of music fans around the world. After the reports came in that the celebrated rock legend has succumbed to cancer after fighting an 18-month long battle, tributes were overflowing as they remembered one of the most influential musicians in his era.

Director James Gunn, for one, is heartbroken and "horribly sad" about the news. The filmmaker is currently working on the Marvel movie sequel "Guardians of the Galaxy Vol. 2" and he revealed in a Facebook post how Bowie could have made an appearance in the superhero film.

"Just a very short while ago [Marvel Studios president] Kevin Feige and I were talking about a cameo role in Guardians Vol. 2, and he brought up Bowie's name," Gunn wrote, adding that "nothing in the world would make me happier" than making that happen.

Gunn then talked about how Bowie has always been his "huge and omnipresent" musical hero, and how his songs helped the director during his trying times back in the day with some of the multi-instrumentalist's hits, now "deeply embedded in my psyche."

Bowie's 1972 track "Moonage Daydream" was used in the first "Guardians of the Galaxy" movie, but his album "Ziggy Stardust," which Gunn deemed the "greatest rock and roll album of all time," was a major influence in the entirety of the film.

The director was actually planning to use another one of Bowie's songs in "Guardians of the Galaxy Vol. 2," which would make him the one and only artist with songs in both films.

"But I heard from common friends he wasn't doing well. We heard back that he was okay and it could possibly happen. Who knows what that was about? But, for whatever reason, it made my Twitter revelation [that Bowie had died] more of a surprise," the director said.

Gunn is extremely grateful for Bowie's work, and how his music changed his life in beautiful ways he never even imagined. "Thank you, David, for all you've given to my life, my relationships, and my career," the director wrote.

Three days prior to his death, Bowie celebrated his 69^th birthday. According to Consequence of Sound, Bowie also did a pictorial for long-time photographer Jimmy King. The photos taken from there are believed to be the singer's final photos.

Around that time, the music icon also released his 28^th and final studio album "Blackstar." Bowie's cancer did not coop him up, as the musician was very much on the go and was always seen in public. Just last week, a music video for a song titled "Lazarus" from his album was released.