Yes, CSI-Lake McConaughy conducted a thorough investigation.

No evidence of shot or trauma.
We (me and a Park Super who found it) theorized perhaps it was on a higher branch and went to swoop on some prey and hit just right (wrong). Or maybe it was on a branch above and died for another reason (west nile?), and just fell in that position.
I'm not a raptor expert, but talked with a CO about it (he's not an expert, but knows more than the boat cop). If someone on here has a better theory, I'd love to hear it. Just a very strange finding.
This was in a grove of old cottonwoods near the Theis Bay area of Lake McConaughy. It was spotted by a third party who originally reported it as an eagle hanging from a tree.
Scott