TODAY 8a: Search for answers in Texas mall shooting. TODAY celebrates nurses. “Book Club” stars in studio 1A. Andy Cohen in studio 1A.

<p>New details about the gunman who opened fire at a crowded mall near Dallas, as the community holds a vigil to honor the victims. Also, TODAY celebrates nurses from New York Presbyterian and Weill Cornell Medical Center. Plus, Diana Keaton, Jane Fonda, Candice Bergen and Mary Steenburgen in studio 1A to talk about their roles in the new movie “The Book Club: The Next Chapter.” And, Andy Cohen shares his story of becoming a dad as he releases his new book “The Daddy Diaries.”</p>