For medical examiners at the Pima County morgue, his was an unusual case. Not in how he died—making the same arduous journey that has claimed thousands of illegal immigrants—but rather because he was identified so quickly.
The death of migrants crossing the border has long been a tragic consequence of illegal immigration and, many say, the increase in U.S. border enforcement. For some, the problem is a powerful motivator in pushing Congress to act this year on immigration reform.
"The language coming out is alarmingly more of the same," said Kat Rodriguez of Coalicion de Derechos Humanos in Tucson, who gathers information on missing migrants from family and friends to give to medical examiners trying to identify the dead.
Thousands more Border Patrol agents, hundreds of miles of fencing, and cameras, sensors and aircraft have made it more difficult to enter the U.S. illegally, prompting smugglers to guide migrants to remote deserts. People walk up to a week in debilitating heat, often with enough bottled water and canned tuna to last only days.
While illegal crossings have dropped dramatically in past years, hundreds of bodies are still found annually on the border. Border agents conduct more than 1,000 rescues each year, and humanitarian groups have placed water stations along the boundary in hope of helping.
In the last 15 years, at least 5,513 migrants have been found dead along the 1,954-mile border with Mexico, including 463 in fiscal year 2012, the Border Patrol reports.
The Tucson sector—which since 2001 has accounted for more migrant deaths than any other Border Patrol sector—located 177 bodies in the last fiscal year. Texas' Rio Grande Valley saw the greatest jump in bodies found: 150 last year compared to 66 in 2011.
In that state, migrants cross the Rio Grande, catch a ride north and then hike for days on vast ranches in Brooks County to avoid a highway checkpoint. The county has no medical examiner and does not test DNA of deceased migrants, who are buried in unnamed graves at a cemetery in the town of Falfurrias.
The situation is similar to what Pima County authorities faced when Arizona became the busiest corridor for illegal crossings more than a decade ago.
"We had no idea this storm was on the horizon," said Bruce Anderson, a forensic anthropologist in Tucson.
At the Pima County Forensic Science Center on The University of Arizona Medical Center campus, file cabinets hold dossiers on more than 700 unidentified corpses discovered since the late 1990s. Many bodies were too decomposed to identify. Others carried false identification or no identification.
Coolers for 262 corpses and refrigerated trucks on call with room for another 45 give the nation's 30th-largest city one of the country's largest morgues.
"Nobody has this problem. Nobody," said Dr. Gregory Hess, Pima County medical examiner.
Since 2001, the office has examined the bodies of 2,067 border crossers, the vast majority of them Mexican men. Men like Ildefonso Martinez.
Martinez, 39, was born and raised in a farming village in the central Mexican state of San Luis Potosi. After paying a smuggler some $200 to get him across the border, he settled in the San Diego area in the early 1990s and worked whatever odd jobs he could find.
Then last March, he agreed to watch the cash register at a friend's convenience store.
Left behind in California were his wife, Juana Garcia, and five children and stepchildren. Desperate to return to them, Martinez tried crossing three times in the mountains east of San Diego but was caught.
Then he decided to try his luck in Arizona. "It will be one night and one day, and we'll be there," Martinez told another crosser, Isaac Jimenez, whom he convinced to come with him.
Jimenez would later share with The Associated Press what happened during the two men's journey north.
At 7 p.m. on Friday, April 20, he said, they crossed into the U.S. with 19 others at Lukeville, a border town 150 miles south of Phoenix. For 10 hours the group traipsed through the desert before resting in a cave. They had resumed their trek under a blazing sun for four more hours when Martinez collapsed.
"'I'm too young to die,'" Jimenez remembered him saying.
"Then he said he didn't know who I was. He began to go crazy, to lose his memory," Jimenez told the AP.
The smuggler insisted the group abandon Martinez, but Jimenez said he stayed, rubbing alcohol on his friend's hot, swollen body and starting a small fire to draw attention. About two hours later, when Jimenez left in search of cellphone coverage, Martinez's eyeballs were rolling and he had stopped talking.
What happened next is unclear. Jimenez said he dialed 911 after about three hours of walking and insists the Border Patrol agents who drove him back to Mexico assured him they would find his friend. The Border Patrol said in a statement that agents arrested Jimenez but that it had no record of him pleading on behalf of Martinez.
Five days later, after frantic phone calls from Martinez's stepdaughter to U.S. and Mexican officials, Border Patrol agents met Jimenez at the Lukeville border crossing and he quickly led them to the body. Birds circled above.
At the Pima County Forensic Science Center, the cause of death was listed as probable hyperthermia. Typically, investigators measure bones and examine teeth to determine gender, date of death, age and other characteristics. If the skin is dried up, they may soak a hand in fluid called sodium hydroxide, rehydrating it to get fingerprints.
Relatives searching for missing loved ones are pressed for details. Any chipped or gold teeth? Tattoos or scars? Broken bones?
"It's like a puzzle," said Robin Reineke, a cultural anthropology graduate student at The University of Arizona who interviews families and feels comforted when her work helps ease their anguish. "I've talked with some of these families for five years. They've been waiting for that long for an answer."
One in three migrant corpses remains unidentified, forcing investigators to send bone or blood samples out for DNA testing. Some bodies stay in coolers for more than a year.
Until the mid-2000s, unidentified remains were buried in Tucson. Now they are cremated to save money. Lockers at the center store the keepsakes of those who go unclaimed: a digital music player, $20 bills, paper with scribbled phone numbers.
With Martinez, investigators had a lot to go on: The personal belongings his family eventually would identify, including a business card for his dentist back in California. Examiners were able to obtain his dental records and make a positive match.
The Mexican government will pay to bring corpses home, but Martinez's family scraped together $16,000 to bury him near their San Diego apartment, the living room walls lined with portraits of his mustachioed face.
"Here we go see him every weekend," said stepdaughter Gladys Dominguez.
Juana, 43, speaks warmly of Jimenez for attempting to save her husband's life. He settled in Fresno, Calif., after sneaking back across the border, and said he wanted the widow to know her husband's last words.
"He did all that he could," she said. Now she hopes that the U.S. government finds a way to do more to prevent such deaths.
"People like my husband need immigration reform," she said. "There are lots of people like him."
Martinez was buried last May, on Gladys' 19th birthday. The gravestone bears a photo of him with Juana at their 2010 wedding and reads, "Juntos Por Siempre." Together Forever.
AP reporter Christopher Sherman in McAllen, Texas, contributed to this report.