Is an elk that has been wounded by an arrow and dies later considered to have "died from natural causes"?

I found a dead bull elk that was wounded in archery season and was never recovered. Can I keep the horns? There is no is no definition of what natural death is in the regs, and only parts of natural deaths can be salvaged.
Answer: 
An arrow wound is not natural.  This animal would not have died if not hit by the arrow.  No parts of this animal can be legally salvaged.
Answered on: 
Monday, September 29, 2014 - 2:24 PM MDT