Local red-tailed hawk documentarian Goggla reported this yesterday:Thanks to Goggla for the photos!
Unfortunately, we have no idea what happened, when exactly the chick passed away, or where the body is now. It's likely still up in the tree, but there is no way to check up there and, without a body, no way to know what caused the chick's death. Any stories floating around the park are pure speculation. The last time we observed the chick, it appeared fine, but they were all still too small to be able to get a really good look at them. Of course, we're watching the remaining two chicks closely.
As she points out, this is not the first time that the resident red-tailed hawks have suffered the loss of their fledglings. In 2018 and 2019, at least one of the chicks died from rodenticide poisoning.