BRIEF-JPMorgan Investment official Tse to leave-memo

Oct 1 (Reuters) - JPMorgan Chase & Co :

* Investment official Irene Tse to leave-memo

* JPmorgan's Tse ran chief investment office in North America

* JPmorgan's Tse leaving for 'entrepreneurial ventures'-memo to JPM


* JPmorgan's Tse had been working to 'refocus' chief investment


* JPMorgan memo on tse departure from chief operating officer Matt


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