SFAppeal breaks today's biggest (local) story: Chief Operating Officer for the SFMTA, Ken McDonald, resigned today. McDonald, who is in charge of Muni operations, gave no specific explanation for the sudden departure. But before you get all hot and bothered over last night's F-Market f-up, Appeal goes on to report that a "Muni insider we spoke to said that he believes that last night's accident was not related to McDonald's departure, but was 'just bad timing.'" McDonald will go into more detail later at today's 2 p.m. SFMTA board meeting. Until then, check out his resignation letter here.