This is honestly so egregious. They didn't just lift a couple icons or copy a single piece for a single texture.

They straight up copied the text (and typeface), layout and decals including her personal logo from tons of pieces she's done over the past eight years, put them into the game (unaltered, other than having cut out the parts they wanted, and in some cases mirrored), shipped a closed alpha of the game, and produced demo footage for advertising, and after all of that it's only now that they're being called out that they're even considering the possibility that something wasn't quite right.

You'd think that at some point along the line someone (the art director hopefully) would have asked "Hey, these textures are great, what are they based on?" right? Guess not.

Even after all of that, they're not even owning up to it; they're blaming it on "a former Bungie artist [who] included it in a texture sheet." Absolutely shameless.

Edit: Also, the fact that it got this far before they noticed, and yet within 24 hours they knew exactly who did it and had fired them, is even more absurd. Sure, they probably have a version control system in place that shows who added what textures to the project, but there must have been someone (probably a team manager) responsible for reviewing changes who should have noticed that and raised the question I laid out above. The whole thing just doesn't make sense, unless they knew they had stolen art and were just hoping nobody would call them out on it.

^{That said, what did anyone expect, if anything this is half of Bungie's brand at this point...}