Investigators believe the body of a teenage male had been stuck in the abandoned building for two years. By Solomon Moore and Richard Winton Times Staff Writers March 29, 2005 The security guard didn't believe his 11-year-old daughter at first. Having just peered down a chimney stack while fetching a soccer ball that she had tossed onto the roof of an abandoned halfway house in South Los Angeles, Nelly Melgoza ran to her father breathless, saying she had seen a human skull. As Thursday night wore on, Nelly continued to insist that she had seen human remains. "I know I...