After partying with friends in Reno, Nevada, on Jan. 19, 2008, Brianna Denison decided to spend the night on the couch when they returned to the house around 4 a.m. At 9 a.m. her friends discovered that Brianna was missing, but her clothes, purse and cell phone were still there. She has not been seen or heard from since. Read more.

UPDATE: The body of Brianna Denison was found Feb. 15, 2008 in a field near a Reno business park.