(CNN) Ellenborough Lewis, the koala who shot to internet fame after being rescued last week from massive wildfires that engulfed the Australian state of New South Wales, has died.

Port Macquarie Koala Hospital made the decision to euthanize Lewis Tuesday after inspecting his wounds. It became clear that the marsupial's burns were not going to improve, the hospital said in a Facebook post

"(Our) number one goal is animal welfare, so it was on those grounds that this decision was made," the hospital said.

Lewis had already been receiving "substantial pain relief," and the hospital warned Saturday that it was considering putting him to sleep if it was determined that "his injuries and his pain are not treatable and tolerable."

Lewis was estimated to be about 14 years old, according to CNN affiliate 9 News

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