Joran van der Sloot, the prime suspect in the 2005 disappearance of Alabama teenager Natalee Holloway, pleaded not guilty to extortion and fraud charges in a Birmingham courtroom on Friday. He is accused of attempting to extort money from Holloway's mother and faces up to 20 years in prison if convicted. Van der Sloot is currently serving a 28-year prison sentence in Peru after confessing to killing a Peruvian woman in 2010. A trial date has not yet been set.