In this June 17, 2015 photo, Yolanda Alvarez Antunez touches photos of her husband, Luis Alberto Ramirez Castillo while speaking to the Associated Press at her home in Ahuehuepan, Mexico. Her husband was 54 years old when he was kidnapped by armed men outside of his home on Jan. 10, 2013. While trying to pay for the ransom, Yolanda herself was taken by the kidnappers and had to pay extra to be freed. She never saw her husband again. (AP Photo/Dario Lopez-Mills)
Yolanda Alvarez Antunez holds up a photo of her husband, Luis Alberto Ramirez Castillo in Iguala, Mexico, June 2, 2015. Her husband was 54 years old when he disappeared on Jan. 10, 2013. (AP Photo/Dario Lopez-Mills)
In this June 17, 2015 photo, religious figures adorn the home of Yolanda Alvarez Antunez while speaking about her husband, Luis Alberto Ramirez Castillo to the Associated Press at her home in Ahuehuepan, Mexico. Her husband was 54 years old when he was kidnapped by armed men outside of his home on Jan. 10, 2013. While trying to pay for the ransom, Yolanda herself was taken by the kidnappers and had to pay extra to be freed. She never saw her husband again. (AP Photo/Dario Lopez-Mills)
In this Sunday, April 19, 2015 photo, Vicenta Hernandez Gomez sits alone as she waits to submit a DNA sample in order to help her search for her missing sons, Daniel and Nazario Gomez Hernandez in Iguala, Mexico. Daniel disappeared on March 1, 2013 and Nazario on Feb. 6, 2014. (AP Photo/Dario Lopez-Mills)
In this June 2, 2015 photo, Alicia Modesta Mendoza Aviles holds up a photo of her missing daughter, Yolanda Mata Mendoza in Iguala, Mexico. Her daughter was 32 years old when she was taken by armed men on July 1, 2013. 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)
In this Aug. 25, 2015 photo, Yolanda Alvarez Antunez shows a copy of the leaflets she has been posting in the streets seeking information about her missing husband, who was kidnapped two years ago, in Iguala, Mexico. Beto, as he was called, was broad and tall, still strong at the age of 54. Rumored sightings of her husband reach her from time to time. (AP Photo/Dario Lopez-Mills)
In this May 31, 2015 photo, receiving an anonymous tip, relatives of missing people trek through a field in search of a possible clandestine grave, in Iguala, Mexico. Relatives of missing persons in the region have banded together to search for their lost family members. Since the government began excavating suspected graves found by this group scouring the surrounding mountains looking for their loved ones late last year, more than 100 bodies have been exhumed though most still await identification. (AP Photo/Dario Lopez-Mills)
In this June 17, 2015 photo, Yolanda Alvarez Antunez enters her gated home and store, from where her husband was kidnapped two years ago, in Ahuehuepan, Mexico. He tried to resist and grabbed onto a pipe outside their small grocery store, a woman who watched from a few meters away told Yolanda later that day. When a second man got out of the truck and stuck a gun in his side, he stopped fighting. (AP Photo/Dario Lopez-Mills)