Pathologist-to-the-stars Cyril Wecht, who on Wednesday conducted a private autopsy on Anna Nicole Smith's son, Daniel, has concluded that a lethal combination of methadone, a pain reliever, and the antidepressants Zoloft and Lexapro caused the 20-year-old's sudden death. Wecht tells the Associated Press, "The fact that we have these drugs and the [low] levels of the drugs overwhelmingly and most logically point to this being a tragic, accidental, drug-related death."