New information about the elementary school shooting in South Carolina. A family friend says it wasn't the first time the teenager accused of opening fire had brought a gun to school. Newly released body cam video shows the disturbing end to a deadly police chase. How deputy marshals reacted after learning they accidentally killed a six year old boy. Donald Trump tries out a new line of attacks against Hillary Clinton and doubles down on his controversial comments about a former Miss Universe. Plus, the libertarian nominee has another "Aleppo moment" on live TV. That and much more on the CBS This Morning podcast.