Kayla Mueller, 26, was a human rights activist and humanitarian aid worker from Prescott, Arizona. In August 2013, she was held captive by the notorious terrorist group, ISIS. She was seized in Aleppo, Syria while leaving a Doctors Without Borders hospital.

On Feb. 6, Kayla Mueller had been reportedly killed by a Jordanian airstrike. However, no proof of the death was provided. But on Tuesday, Feb. 10, Mueller's family confirmed that Kayla had died. According to The New York Times, ISIS confirmed her death in an email with three photographs of her dead body.

As the nation mourns the loss of a fallen heroine, here are some inspiring insights about Kayla Mueller's life.

Kayla Mueller was born to do good works, AZ Central shared. Since graduating from college in 2009, Kayla traveled the world. She went to India, Israel and to the Palestinian territories. She volunteered in an Arizona HIV/AIDS clinic. In 2012, she helped refugees and families who had been forced to flee their homes at the Turkish-Syrian border.

While in captivity, Kayla remained resilient and hopeful. In the spring of 2014, she wrote a letter to her family, The Daily Courier revealed.

"None of us could have known it would be this long but know I am also fighting from my side in the ways I am able + I have a lot of fight left inside of me," she wrote. "I am not breaking down + I will not give in no matter how long it takes."

Kayla Mueller's mission in life seemed to have been guided by her favorite quote, which was from the autobiography of British philosopher and Nobel prize-winning author, Bertrand Russell.

"Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and the unbearable pity for the suffering of mankind," the quote reads.

Unfortunately, Mueller was killed while trying to eradicate "human suffering from the world's most vulnerable victims," The Huffington Post reported.

"For as long as I live, I will not let this suffering be normal," Mueller once said. "It's important to stop and realize what we have, why we have it and how privileged we are. And from that place, start caring and get a lot done."

And according to The Independent UK, she had also spoken about her mission.

"I find God in the suffering eyes reflected in mine, if this is how you are revealed to me, this is how I will forever seek you," Kayla stated.

Kayla Mueller saw the state of the world and dedicated her young life to ease the suffering of others. Though in captive, she still echoed inspiring and hopeful words. And as America grieves her death, her exceptional legacy will always be remembered.