An executive for Berkshire Hathaway Inc.’s Gen Re insurance unit will plead guilty later this week to a criminal charge that he helped rival American International Group Inc. exaggerate its finances and will cooperate in the continuing investigation, his lawyer said Monday.

John Houldsworth, 46, will plead guilty to one count of conspiring with others to misstate the financial statements of AIG, the nation’s biggest insurance company, his lawyer, Larry Byrne, said in a statement.