A year later, Mexico still remembers the 43 missing students

A woman wears a skull mask as she stands in front of the National Palace during a rally by relatives and supporters of 43 missing teacher's college students in the Zocalo, Mexico City's main square, Wednesday, Sept. 23, 2015. Days ahead of the one year anniversary of the Ayotzinapa students' disappearance on Sept. 26, 2014, parents and relatives started a 43 hour protest fast. (AP Photo/Rebecca Blackwell)

Ayotzinapa students chant during a rally by parents and supporters of 43 missing teacher's college students in the Zocalo, Mexico City's main square, Wednesday, Sept. 23, 2015. Days ahead of the one year anniversary of the Ayotzinapa students' disappearance on Sept. 26, 2014, parents and relatives started a 43 hour protest fast. (AP Photo/Rebecca Blackwell)

Photographers find a viewpoint atop a sports utility vehicle as relatives of 43 missing teacher's college students speak during a rally in the Zocalo, Mexico City's main square, Wednesday, Sept. 23, 2015. Days ahead of the one year anniversary of the Ayotzinapa students' disappearance on Sept. 26, 2014, parents and relatives Wednesday evening started a 43 hour protest fast. (AP Photo/Rebecca Blackwell)

Relatives of of the 43 missing students from the Isidro Burgos rural teacher's college, hold up their fists during a press conference after a meeting with Mexico's President Enrique Pena Nieto, in the Zocalo, Mexico City's main square, Thursday, Sept. 24, 2015. Pena Nieto told the families that he would create a new special prosecutor for all of the country's thousands of missing people. (AP Photo/Marco Ugarte)

A person holds a sign that reads in Spanish "Ayotzinapa, we are missing 43. A crime by the state!" during a protest for the 43 missing students from the Isidro Burgos rural teacher's college in the Zocalo, Mexico City's main square, Thursday, Sept. 24, 2015. President Enrique Pena Nieto told the families of 43 students who disappeared a year ago in southern Mexico, that he would create a new special prosecutor for all of the country's thousands of missing people. (AP Photo/Marco Ugarte)

A person holds a sign that reads in Spanish "Pena Out!" during a protest for the 43 missing students from the Isidro Burgos rural teacher's college in the Zocalo, Mexico City's main square, Thursday, Sept. 24, 2015. President Enrique Pena Nieto told the families of 43 students who disappeared a year ago in southern Mexico during a meeting Thursday that he would create a new special prosecutor for all of the country's thousands of missing people. (AP Photo/Marco Ugarte)

First year Ayotzinapa students, including Brian, right, who had known two of the 43 missing teacher's college students, chant during a rally in the Zocalo, Mexico City's main square, Wednesday, Sept. 23, 2015. Days ahead of the one year anniversary of the Ayotzinapa students' disappearance on Sept. 26, 2014, parents and relatives started a 43 hour protest fast. (AP Photo/Rebecca Blackwell)

Felipe de la Cruz, left, the father of one of the 43 missing students from the Isidro Burgos rural teacher's college, listens to a relative of the missing during a conference after a meeting with Mexico's President Enrique Pena Nieto, in the Zocalo, Mexico City's main square, Thursday, Sept. 24, 2015. Pena Nieto told the families that he would create a new special prosecutor for all of the country's thousands of missing people. (AP Photo/Marco Ugarte)