Twenty-nine years ago today, an assassin’s bullet struck and killed Dr. Martin Luther King Jr. as he walked along the balcony of the Lorraine Motel in Memphis, Tennessee. Today we go back to that fateful day and examine the new allegations by the King family and others that the man serving a life sentence for the murder of Dr. King may not be guilty. We speak with reporter Earl Caldwell and David Garrow, professor of history at Emory University Law School and author of “Bearing the Cross: Martin Luther King, Jr. and the Southern Christian Leadership Conference” and “The FBI and Martin Luther King.”