Photos: Kayla Mueller, Arizona aid worker

Members of the community gather at a candlelight vigil for Kayla Mueller at the NAU Lutheran Campus Ministry February 14, 205 in Flagstaff, Arizona. Mueller died whilst being held prisoner by ISIS in the middle east.

Members of the community gather at a candlelight vigil for Kayla Mueller at the NAU Lutheran Campus Ministry February 14, 205 in Flagstaff, Arizona. Mueller died whilst being held prisoner by ISIS in the middle east.

Members of the community gather at a candlelight vigil for Kayla Mueller at the NAU Lutheran Campus Ministry February 14, 205 in Flagstaff, Arizona. Mueller died whilst being held prisoner by ISIS in the middle east.

Members of the community gather at a candlelight vigil for Kayla Mueller at the NAU Lutheran Campus Ministry February 14, 205 in Flagstaff, Arizona. Mueller died whilst being held prisoner by ISIS in the middle east.

Members of the community gather at a candlelight vigil for Kayla Mueller at the NAU Lutheran Campus Ministry February 14, 205 in Flagstaff, Arizona. Mueller died whilst being held prisoner by ISIS in the middle east.

Members of the community gather at a candlelight vigil for Kayla Mueller at the NAU Lutheran Campus Ministry February 14, 205 in Flagstaff, Arizona. Mueller died whilst being held prisoner by ISIS in the middle east.

Members of the community gather at a candlelight vigil for Kayla Mueller at the NAU Lutheran Campus Ministry February 14, 205 in Flagstaff, Arizona. Mueller died whilst being held prisoner by ISIS in the middle east.

Kayla Mueller

Kayla Mueller volunteered at Food for Life Vrindavan in 2010. According to the group's website, Food for Life Vrindavan is a humanitarian aid organization that for the last 10 years has worked in the poorest villages in the Vrindavan area south of New Delhi.

Kayla Mueller volunteered at Food for Life Vrindavan in 2010. According to the group's website, Food for Life Vrindavan is a humanitarian aid organization that for the last 10 years has worked in the poorest villages in the Vrindavan area south of New Delhi.

Kayla Mueller volunteered at Food for Life Vrindavan in 2010. According to the group's website, Food for Life Vrindavan is a humanitarian aid organization that for the last 10 years has worked in the poorest villages in the Vrindavan area south of New Delhi.

Meg Moyer, 9, and her father, Kip Moyer, look at a temporary memorial for Kayla Mueller at the Campus Ministry Center at Northern Arizona University Wednesday, Feb. 11, 2015. Mueller attended the center while a student at NAU in Flagstaff.

A temporary memorial for Kayla Mueller lights up the Campus Ministry Center at Northern Arizona University Wednesday, Feb. 11, 2015. Mueller attended the center while a student at NAU in Flagstaff.

Mary Ellen Halvorson, Director at Tri-City Prep High School is overcome with emotion as she looks at photos of Kayla Mueller from her 2007 senior yearbook on Wednesday, Feb. 11, 2015 in Prescott, AZ. The White House confirmed Tuesday the death of American aid worker Kayla Mueller, 26, from Prescott, AZ, four days after Islamic State militants claimed she had been killed by Jordanian airstrikes in Syria. (Rob Schumacher-The Arizona Republic)

Molly Hock, 26, who was a roommate with Kayla Mueller at Northern Arizona University, talks about her friend and how much she will miss her. Hock's boyfriend, Kyle NIxon, 31, lends support as the two sit outside the Campus Ministry Center in Flagstaff, reminiscing about Mueller, Wednesday, February 11, 2015.

A pink cowboy hat rests in the flowers at a small memorial in honor of Kayla Mueller next to Whiskey Row on Wednesday, Feb. 11, 2015 in Prescott, AZ. The White House confirmed Tuesday the death of American aid worker Kayla Mueller, 26, from Prescott, AZ, four days after Islamic State militants claimed she had been killed by Jordanian airstrikes in Syria. (Rob Schumacher-The Arizona Republic)

Kayla Mueller volunteered at Food for Life Vrindavan in 2010. According to the group's website, Food for Life Vrindavan is a humanitarian aid organization that for the last 10 years has worked in the poorest villages in the Vrindavan area south of New Delhi.

In this May 30, 2013, photo, Kayla Mueller is shown after speaking to a group in Prescott.

Kayla Mueller and her niece.

Kayla Mueller

Kayla Mueller

The U.S. State Department has not been able to confirm the ISIS report that Jordanian airstrikes killed Mueller (left) of Prescott, Arizona.

Kayla Mueller with her father, Carl.

Kayla Mueller as a toddler.

Kayla Mueller and her family.

Kayla Mueller is a 26-year-old American humanitarian worker from Prescott, Arizona.

In this May 30, 2013, photo, Kayla Mueller is shown after speaking to a group in Prescott, Ariz.

Ted Dwyer met Kayla Mueller after lending office space to Flagstaff New Day Peace Center in Flagstaff. Mueller was confirmed dead by her family while a hostage of ISIS Feb. 10, 2015.

Peggy Sheldon-Scurlock reflects on her memories of her friend, Kayla Mueller, in her office in Flagstaff Feb. 10, 2015. Mueller was confirmed dead by her family while a hostage of ISIS.

Lori Lyon cries after reading a family statement about the death of her niece Kayla Mueller during a press conference on Tuesday, Feb. 10, 2015 in Prescott, Ariz.

Terri Crippes and Lori Lyon (right) cry after reading a family statement about the death of their niece Kayla Mueller during a press conference outside Prescott Court house on Feb. 10, 2015.

Kathleen Day, head of United Christian Ministry, reading a family statement about the death of Kayla Mueller during a press conference outside Prescott Court house on Feb. 10, 2015.

Eryn Street, a childhood friend of Kayla Mueller, reading a statement about the death of Kayla Mueller during a press conference outside Prescott Court house on Feb. 10, 2015.

In this April 28, 2007, photo, high school senior Kayla Mueller marches in a walk in Prescott, Ariz., promoting aid to the Darfur region of Sudan. A statement that appeared on a militant website commonly used by the Islamic State group claimed that Mueller was killed in a Jordanian airstrike on Friday, Feb. 6, 2015, on the outskirts of the northern Syrian city of Raqqa, the militant group's main stronghold. The IS statement could not be independently verified. Prescott Daily Courier, Nathaniel Kastelic)

The Mueller family awaits word on fate of ISIS held Ariz. aid worker Kayla Mueller. Their Prescott home is the light grey one.

A sign asking people to pray for Kayla Mueller, an ISIS held Ariz. aid worker, is posted in downtown Prescott.

Yavapai County Sheriff law enforcement block the street to the home of the Mueller family in Prescott on February 6, 2015. The family awaits word on fate of ISIS held Ariz. aid worker Kayla Mueller, 26.

A sign asking people to pray for Kayla Mueller, an ISIS held Ariz. aid worker, is posted in downtown Prescott.

Kevin Morrow (standing from left, Opinions editor and Vincent Pena, editor-in-chief, work with the rest of the staff of Northern Arizona University's newspaper, the Lumberjack, in the Lumberjack newsroom in Flagstaff, Ariz., on Feb. 6, 2015.

A sign that reads "Pray for Kayla" is posted at Courthouse Plaza on Monday, Feb. 9, 2015 in Prescott, Ariz. I

Zana Alattar, 20, center with other students from The Muslim Liberty Project (MLP) hold a candlelight vigil in honor of victims of ISIS at the Hayden Lawn, ASU Tempe Campus on Monday, Feb. 9,2015.

ASU students and Americans representing all faiths gathered at the Hayden Lawn, ASU Tempe Campus on Monday, Feb. 9,2015. to honor those who have fallen victim to ISIS.

Seema Kassab (front) of The Muslim Liberty Project (MLP) holds a candlelight vigil in honor of victims of ISIS at the Hayden Lawn, ASU Tempe Campus on Monday, Feb. 9,2015.

The Muslim Liberty Project holds a candlelight vigil Monday on Hayden Lawn at Arizona State University's Tempe campus in honor of ISIS hostage Kayla Mueller and other victims of the terror group.

Turi Whiting of Minneapolis leaves a bouquet of flowers at a "Pray for Kayla" sign in downtown Prescott on Monday, Feb. 9, 2015.

Zana Alattar (left) Kaylea Brase (middle), Iqra Ahmed (right) and other Arizona State University students gather for a candlelight vigil at ASU's Tempe campus on Monday, Feb. 9, 2015.

Students from The Muslim Liberty Project (MLP) hold a candlelight vigil at the Hayden Lawn, Arizona State University Tempe Campus in honor of victims of ISIS on Monday, Feb. 9,2015.

Eryn Street, a childhood friend of Kayla Mueller, reading a statement about the death of Kayla Mueller during a press conference outside Prescott Court house on Feb. 10, 2015.

Kayla Muller during a humanitarian trip to Guatemala with a church group.

Kayla Muller (center) during a humanitarian trip to Guatemala with a church group.

Friend Andrew Shepherd explains, "Those are the names of the people who died in Guatemala as a result of military violence during he civil war, many in massacres. There are a ton of those around the Cathedral in Downtown Guatemala City. I remember Kayla and I having the realization that some of the groups of names were entire families of people who were killed."

Kayla Muller (left) during a humanitarian trip to Guatemala with a church group.

Kayla Muller (center) during a humanitarian trip to Guatemala with a church group.

Kayla Muller during a humanitarian trip to Guatemala with a church group.

Kayla Muller and friends during a humanitarian trip to Guatemala with a church group.