Robert Khuzami, who led the U.S. Securities and Exchange Commission’s enforcement division’s pursuit of financial industry wrongdoing related to the subprime crisis, plans to step down as early as next month, three people with knowledge of the matter said.

Khuzami, 56, notified SEC Chairman Elisse Walter of his decision earlier this month, according to the people, who asked not to be identified because the matter isn’t public. Walter has yet to choose a replacement, the people said.