In this April 19, 2015 photo, Guadalupe Contreras Olea holds up a photo of his missing son Antonio Ivan Contreras Mata, in Iguala, Mexico. His son went missing on Oct. 13, 2012. The disappearance of the students from the Rural Normal School of Ayotzinapa on Sept. 26, 2014, gave hundreds of other families who had loved ones vanish the courage to come forward, many for the first time, to report the crimes. These, they said, were the "other disappeared." (AP Photo/Dario Lopez-Mills)