An investigator at the Securities and Exchange Commission warned superiors as far back as 2004 about irregularities at Bernard L. Madoff's financial management firm, but she was told to focus on an unrelated matter, according to agency documents and sources familiar with the investigation. Genevievette Walker-Lightfoot, a lawyer in the SEC's Office of Compliance Inspections and Examinations, sent e-mails to a supervisor, saying information provided by Madoff during her review didn't add up.
