Three weeks ago, an elderly couple died while hiking in "The Wave" area of Kane County, near the Utah-Arizona border.  They were ages 69 and 70.

But this time, it was a seemingly healthy 27-year-old Arizona woman, who was apparently overcome by heat, while hiking with her husband, to celebrate their 5th wedding anniversary.

By the time a medical helicopter arrived, the woman was in cardiac arrest -- and could not be revived.

She leaves her husband, and children ages 4 and 5.