Los Angeles police Cmdr. Andrew Smith (center) prepares to speak to the media in front of the Bronson Canyon Park entrance in Los Angeles on Wednesday, Jan. 18, 2012, as detectives search the neighborhood below the Hollywood sign after a plastic bag containing a human head was discovered Tuesday on a nearby trail. (AP Photo/Jason Redmond)

Photo by: Jason Redmond

Los Angeles police Cmdr. Andrew Smith (center) prepares to speak to the media in front of the Bronson Canyon Park entrance in Los Angeles on Wednesday, Jan. 18, 2012, as detectives search the neighborhood below the Hollywood sign after a plastic bag containing a human head was discovered Tuesday on a nearby trail. (AP Photo/Jason Redmond)