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Cyril Wecht – the forensic pathologist, who performed an autopsy on Anna Nicole Smith's son, Daniel – tells People.com that the 20-year-old died due to a lethal combination of methadone, Zoloft and Lexapro. Those drugs apparently caused the cardiac dysrhythmia that led to Daniel's death. Related: Anna Nicole's Lawyer: I'm Her Baby's Dad Anna Nicole Makes Big $$$ Off Son's Final Photos Second Autopsy for Anna Nicole's Son Anna Nicole: Joy and Tragedy