WASHINGTON — Jamie Dimon, JPMorgan Chase's chief executive, is not expected to be among the witnesses appearing before a Senate Permanent Subcommittee on Investigations hearing examining the bank's multi-billion dollar proprietary trading debacle revealed last May.

The investigations panel, chaired by Sen. Carl Levin, D-Mich., released its witness list for the highly anticipated hearing on the "London Whale" mess on Wednesday. The list includes two former bankers, Ina Drew, who was the JPMorgan's chief investment officer, and Peter Weiland, who served as its head of market risk, along with three current executives: Ashley Bacon, the acting chief risk officer, Douglas Braunstein, a vice chairman and former chief financial officer, and Michael Cavanagh, who heads the bank's task force investigating the losses from the London Whale's trades.

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