An American man suspected of fighting for the Islamic State extremist group was killed in Syria last weekend, the White House has confirmed.
US officials said they were aware that Douglas McCain, 33, had travelled to the country to join a militant group. He was killed in a battle with another insurgent group, the Free Syrian Army, according to NBC News.
McCain's American passport was reportedly found in his pocket along with about $800 (£480) in cash.
His uncle, Ken McCain, said the State Department had informed the "devastated" family of his nephew's death.
McCain converted from Christianity to Islam several years ago, according to the uncle. White House spokeswoman Caitlin Hayden confirmed the death. The FBI is said to be investigating.
State Department spokeswoman Jen Psaki said: "We are in contact with the family and are providing all possible consular assistance."
On Facebook, where McCain used the name Duale ThaslaveofAllah, he had posted comments sympathetic to Islamic State, and uploaded a photo of its black flag.
His Twitter biography reads: "It's Islam over everything."
McCain reportedly grew up around Minneapolis, Minnesota, before attending community college in San Diego, California.
He is said to have been interested in rap and basketball before turning to militancy.