Are you referring to this buck?

http://www.huntingnet.com/fieldjournal/fieldjournal_detail.aspx?nID=482

That deer is definately a Mule Deer Has all the characteristics of one. Mulie/Whitetail crosses usually look very close to a whitetail in the body and rack, except for certain characteristics like forked tines, large frame, etc. I've seen a few around here that have been taken, and you usually wonder if it is a Whitetail or Mulie/WT cross, rather than is it a Mulie or Mulie/WT cross. Just my 2 cents.