As officials confirm the death of aid worker Peter Kassig at the hands of Islamic State, his parents and US President Barack Obama have released statements praising him for "living his life according to his humanitarian calling." Nathan Frandino reports.

Peter Kassig, the US aid worker beheaded by Islamic State, was remembered for his courageous devotion to helping the Syrian people.

His parents, Ed and Paula Kassig, who in an October video pleaded for their son's freedom, released a statement, saying, quote, "We are incredibly proud of our son for living his life according to his humanitarian calling."

President Barack Obama confirmed the Indiana native's death.

He praised Kassig as a humanitarian killed in "an act of pure evil."

Kassig was kidnapped in October 2013 while traveling for an aid project to the eastern Syrian city of Deir al-Zor.

With his death, Kassig became the fifth Western hostage killed by Islamic State.

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