Representatives for Lehman Brothers want to question the so-called London Whale in connection with a lawsuit accusing JPMorgan Chase (JPM) of hastening the investment bank's collapse.

Bruno Iksil, an former JPMorgan Chase employee who worked for the company in London, "played a greater role in events underlying this litigation" than Lehman had previously known, the defunct company and a committee of its unsecured creditors claimed in court papers filed Wednesday in Manhattan bankruptcy court.

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