was killed Friday while at work covering the upcoming election in Afghanistan.
Niedringhaus had spent years working in conflict zones, from Iraq to Libya, and her work alongside AP reporter Kathy Gannon had shone a light on the lives of ordinary people in Afghanistan and Pakistan. Gannon was injured in the same attack on Friday.
In the photo above, Afghan children peer through a fence at others splashing around a swimming pool on a hill overlooking Kabul, on May 17, 2013.
Niedringhaus was in a car in eastern Afghanistan with writer Kathy Gannon on April 4, 2014 when, according to a freelancer who was with them, an Afghan policeman approached them, yelled "Allahu Akbar" - God is Great - and opened fire on them in the back seat with his AK-47. Niedringhaus was killed instantly and Gannon was wounded.
. Afghan day laborer Zekrullah, 23, takes a break after preparing kilns to fire the bricks at a brick factory on the outskirts of Kabul, Nov 7, 2013. In the last two years as U.S. and NATO troops prepare to leave Afghanistan, brick makers say business has dropped off by almost half.
. A U.S. soldier arrives to the scene where a suicide car bomber attacked a NATO convoy in Kabul on May 16, 2013. A Muslim militant group, Hizb-e-Islami, claimed responsibility for the early morning attack, which killed many.
. An Afghan man directs his frightened children away from the scene where a suicide car bomber had attacked a NATO convoy in Kabul on May 16, 2013.
. Afghan Army soldiers gather at a military training facility on the outskirts of Kabul, May 8, 2013.
. An Afghan woman holds her newborn baby wrapped in her burqa as she waits to try on a new burqa in a shop in the old town of Kabul on April 11, 2013. Despite advances in women’s rights, Afghanistan remains a deeply conservative country and most women continue to wear the Burqa. But tradesmen say times are changing in Kabul at least, with demand for burqas declining as young women going to school and taking office jobs refuse to wear the cumbersome garments.
Recounting the incident, Niedringhaus described how Trevino had collapsed on a stretcher, exhausted, after reaching the helicopter. "You have made it! You have made it!" a medic shouted. Trevino lifted his head to scream: "Yes, I have made it!"
. A Canadian soldier with the 1st Battalion, The Royal Canadian Regiment rests next to his guns after a mission in Khebari Ghar, south-west of Kandahar, on June 3, 2010.
Niedringhaus was part of an AP team that was awarded a Pulitzer prize in 2005 for photographs of the bloody conflict in Iraq.
. An Iraqi woman gestures as she tries to flee the fighting in the center of Fallujah, Nov. 12, 2004.
. A U.S. Marine cries during the memorial service for 31 killed American servicemen at Camp Korean Village, near Rutbah, western Iraq, on Feb. 2, 2005.
. An Iraqi man cries after learning that a relative was killed in an explosion outside a police station in the Baghdad suburb of Al Sadr on Oct. 9, 2003.
. A man folds up the Palestinian flag as he salvages furniture from a destroyed Palestinian Government complex in Gaza City, Jan. 25, 2009.
. Ismail Mehr, 36, left, chief of anesthesiology at St. James Mercy Hospital in Hornell, New York, prepares Palestinian boy Abdullah Shawwa, 4, for surgery in the Shifa hospital in Gaza City, Jan. 27, 2009. Abdullah suffers from a kidney tumor the size of a watermelon and would not have made it without the quick intervention from the American surgery team.
. A makeshift chairlift crosses the Swat river on the outskirts of Mingora, in Pakistan's Swat Valley, on Oct. 3, 2013. The chairlift begins near the former headquarters of the Taliban, who were driven from the valley in a military operation in 2009.
. A young girl peeks out from the barred entrance to the Khushal School for Girls in Mingora, Swat Valley, on Nov. 15, 2012. Malala Yousufzai, the Pakistani school girl who was shot by the Taliban, had attended Khushal School.
. A young girl reaches out to greet a Pakistani policeman securing the road outside Kainat Riaz's home in Mingora, Swat Valley, on Nov. 15, 2012. Security was stepped up after Kainat was wounded by the same Taliban gunman who shot Malala Yousufzai and 13-year-old Shazia Ramazan on their way home from school.
. Libyan rebels retreat as mortars are fired on them by Moammar Gadhafi's forces on the outskirts of the city of Ajdabiya, eastern Libya, on March 22, 2011.
. A Libyan rebel prays next to his gun on the frontline near Ajdabiya, March 21, 2011.
. An injured soldier loyal to Libyan leader Moammar Gadhafi is interrogated by a rebel soldier at the Jalaa hospital in Benghazi on March 19, 2011, after his capture.
In this photo from the 2008 Olympics in Beijing, Usain Bolt reacts as he wins the men's 100-meter final with a world-record time. Remarkably, the photo appeared to show Bolt's lace had become undone before he crossed the finish line.
. Britain's Mohamed Farah celebrates as he crosses the finish line to win the men's 5000-meter final at the 2012 Summer Olympics in London.
. South Africa's Oscar Pistorius starts in the men's 400-meter semifinal at the 2012 Summer Olympics in London.
. Niedringhaus was a regular chronicler of the All England Lawn Tennis Championships at Wimbledon. Here, Serena Williams celebrates after winning against Zheng Jie of China during a third round women's singles match on June 30, 2012.
"I was so concerned about her safety. And she was like, 'Momo, this is what I'm meant to do. I'm happy to go,'" Muheisen recalled.
In the photo above, taken on March 12, 2014, school children pass by a sign reading, "ballot not bullet" on their way home on the outskirts of Kandahar.
. A carpet seller holds up a framed carpet depicting Afghan President Hamid Karzai in his store in Kabul, March 30, 2014. Afghans go to the polls on April 5 to choose a new president.
"I don't believe conflicts have changed since 9/11 other than to become more frequent and protracted," Niedringhaus told The New York Times in a 2011 email exchange. "But the essence of the conflict is the same — two sides fighting for territory, for power, for ideologies. And in the middle is the population who is suffering."