Brianna Denison, 19, mysteriously disappeared from a friend's house in Reno, Nev., more than 48 hours ago. She's petite, under 100 lbs., and has long, dark hair. A friend had gotten a ride from an unknown individual to the house where Denison later disappeared while sleeping on a couch. Denison left behind her cell phone, purse, and clothing. If you have any information on her disappearance, please contact the Reno authorities.