AP - A high school senior was arrested Monday as a suspect in the killing of a 16-year-old classmate whose body was found in a shallow desert grave near the Utah-Nevada line.<p><strong>Read more:</strong> <a class="rssreadon" rel="external" title="Classmate arrested in death of popular Nevada girl   (AP)" href="http://us.rd.yahoo.com/dailynews/rss/education/*http%3A//news.yahoo.com/s/ap/20110307/ap_on_re_us/us_missing_nevada_girl" target="_blank">http://us.rd.yahoo.com/dailynews/rss/education/*http%3A//news.yahoo.com/s/ap/20110307/ap_on_re_us/us_missing_nevada_girl</a></p>