In a month marking its 13th anniversary, we look at one of the great mysteries of the U.S. military prison at Guantánamo Bay: what happened the night of June 9, 2006, when three prisoners died. The Pentagon said the three — Yasser Talal al-Zahrani, Salah Ahmed al-Salami and Mani Shaman al-Utaybi — all committed suicide. But were they actually actually tortured to death at a secret CIA black site at the base? In a broadcast exclusive, we are joined by Joseph Hickman, a Guantánamo staff sergeant and author of the new book, "Murder at Camp Delta: A Staff Sergeant’s Pursuit of the Truth About Guantánamo Bay." We are also joined by professor Mark Denbeaux, director of Seton Hall University School of Law’s Center for Policy and Research, which has just published the new report, "Guantánamo: America’s Battle Lab."