DALLAS -- Oklahoma bond power broker Robert Cochran left his job this week as executive vice president at Stifel, Nicolaus & Co. amid investigations of bond deals by three federal agencies and changes in the firm's public finance operation.

In a tersely worded announcement issued late Tuesday afternoon, the St. Louis-based securities firm and Cochran said they had severed their business relationship. A 20-year veteran with the firm, Cochran was in charge of the municipal bond operations for Oklahoma and other states and was based in the Oklahoma City office.

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