Yesterday marked the one month anniversary of Trayvon Martin’s death. The 17-year-old was shot and killed while visiting his father by George Zimmerman, a self-appointed neighborhood watch captain. Details of the killing have been coming out slowly, but yesterday the case took a number of significant turns – among them, a report that  Martin knocked Zimmerman to the ground and beat him before Zimmerman fired. Today, we review the  new developments and speak with a reporter on the scene. Michael Bender  is a reporter for Bloomberg News and joins us from Sanford, Florida.