In an abrupt departure, Angela Styles, the outgoing chair of storied Washington, D.C., based Crowell & Moring, told colleagues Thursday morning that she will leave the firm after this week, according to a memo obtained by ALM.

Crowell confirmed last week that it had voted out Styles after just one term, with Philip Inglima, a partner in the firm’s white-collar and regulatory enforcement group, named chair-elect. But Styles’ sudden internal announcement this week is unusual. The firm said last week that the new chair’s term begins in March.