"After I heard about P-22, passing, I knew I had to honor him in some way," Mattie said.
The mountain lion visited Mattie in her backyard in March, growing her fascination with the animal.
In October, Mattie teamed up with Save LA Cougars and the California Wildlife Federation to paint a massive mural in Silver Lake for P-22 Day.
Once the public got word of his passing, people left flowers by the Silver Lake mural.
"This was just so out of left field for me that I knew I just needed to paint a memorial," said Mattie.
Watch the video above for the full story.
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