misconduct. trump's campaign calls this new allegation false and ridiculous. earlier trump vowed to sue all of his accusers to date. >> and hillary clinton and tim kaine will hold a rally in pennsylvan pennsylvania. for now back to "dateline extra." welcome back to "dateline extra." i'm tamron hall. homeowner markus kaarma told police he was living in a state of fear, but his answers raised more questions. what really happened in that garage and what was diren dede doing there in the first place. to find out more, they needed to learn more about the german exchange student. here is josh mankiewicz with "deadly exchange." >> reporter: when he was killed in a neighbor's garage, exchange student diren dede was just two months away from returning to his family in germany. the man who shot him said he feared for his life.