1 of 2
Jon Furniss, Invision
Writer and director James Gunn attends the "Guardians of the Galaxy" premiere in Leicester Square, London on Thursday, July, 24, 2014.

SALT LAKE CITY — The Marvel Cinematic Universe lost one of its littlest heroes this week, or at least the unsung inspiration behind him.

What happened: Oreo, the real-life model for Rocket Raccoon from "Guardians of the Galaxy," passed away Thursday morning after a short illness, according to the BBC News.

  • Oreo was 10 years old.

Quinta Layla, an animal refuge in Portugal that housed Oreo, posted about the raccoon on Facebook Thursday.

1 comment on this story
  • “You loved all people of all ages and other animals too and were never phased by anything, be it a walk down the red carpet as Rocket Raccoon, a trip to a hospice to visit a sick child or anything else that came your way,” Quinta Layla wrote. “You just enjoyed everything and it showed. You instinctively knew when to calm, when to be bouncy and we never worried that you would do the wrong thing because you never did. You were perfect.”

Oreo appeared alongside director James Gunn on the red carpet during the “Guardians of the Galaxy” premiere, according to ComicBook.com.

Rocket Raccoon, whose physical characteristics were based on Oreo’s, was voiced by Bradley Cooper in “Guardians of the Galaxy” (2014) and its sequel in 2017.

Oreo will live through Rocket one more time when “Avengers: Endgame” hits theaters on April 26.