Via Hotline:

Rep. Eric Massa (D-NY) is finished with Congress after a single term, he plans to announce in a press conference call today, sources confirm to Hotline OnCall.
Massa, a former top aide on the House Armed Services Committee and aide to ret. Gen. Wes Clark, will cite health reasons in his announcement, the New York Daily News, which broke the story, reported today, though Massa warned a source for the paper about “hearing things that aren’t true,” a seemingly veiled reference to embarrassing information that may emerge.

Roll Call reports he has cancer. Best wishes for recovery.

UPDATE: Politico is also reporting “allegations that he sexually harassed a male staffer.”