Jack Teixeira, the Massachusetts Air National Guardsman accused of leaking classified military documents online, will plead guilty during an upcoming hearing, according to a spokesperson for his family. Subscribe to WCVB on YouTube now for more: http://bit.ly/1e8lAMZ Get more Boston news: http://www.wcvb.com Like us: https://www.facebook.com/wcvb5 Follow us: https://twitter.com/WCVB Instagram: https://www.instagram.com/wcvb5/