Jan. 18, 2012: Los Angeles Police Cmdr. Andrew J. Smith prepares to speak to media in front of the Bronson Canyon Park entrance as Los Angeles Police detectives search the neighborhood below the Hollywood Sign. (AP)
Jan. 18, 2012: Hikers pass through Griffith Park near the Hollywood sign after a human head was discovered nearby. (AP)
Jan. 18, 2012: Hikers pass through Griffith Park near the Hollywood sign after a human head was discovered nearby.
Jan. 18, 2012: Los Angeles Police Cmdr. Andrew Smith, left, talks to Los Angeles Coroner Detective Rene Grand Pre in Griffith Park. (AP)
Jan. 18, 2012: Los Angeles Police detectives work a crime scene in Griffith Park off Canyon Drive. (AP)
Jan. 18, 2012: Los Angeles Police detectives work a crime scene in Griffith Park off Canyon Drive. (AP)
Jan. 18, 2012: Los Angeles County coroner's investigator Rene Grand Pre walks a human-remains detecting K9 as police search the neighborhood below the Hollywood Sign. (AP)
Dec. 18, 2012: Los Angeles Police detectives Jeff Sandefur, right, and Claudia Castruita stand at the entrance of Bronson Canyon Park as they search the neighborhood. (AP)
Jan. 18, 2012: Mounted Los Angeles police officers search the Bronson Canyon area of Griffith Park. (AP)
Jan. 18, 2012: Mounted Los Angeles police officers search the Bronson Canyon area of Griffith Park. (AP)
Jan. 18, 2012: Mounted Los Angeles police officers search the Bronson Canyon area of Griffith Park. (AP)
Jan. 18, 2012: Los Angeles Police investigators stand near a taped-off section in the Bronson Canyon area of Griffith Park (AP)