WASHINGTON, DC (NBC) - It appears Douglas McArthur McCain was not alone. There are now reports a second American jihadist has been killed fighting with Isis militants in Syria.
"Foreign fighters could go over there, get radicalized, get equipped, get trained and then come back to their homelands," said Pentagon Press Secretary John Kirby.
The US believes as many as 100 Americans may have joined Isis.
The beheading of journalist James Foley has raised concerns about another american hostage.
Steven Sotloff's mother made a direct appeal to Islamic leaders:
"As a mother, I ask your justice to be merciful and not punish my son for matters he has no control over, said mother Shirley Sotloff. "I ask you to use your authority to spare his life."
The White House says they're working to bring Sotloff home, but will not pay ransom.
Peter Theo Curtis is now home. He was held by a different radical group in Syria, linked to al-Qaeda.
The administration is now doing surveillance over Syria, and considering airstrikes to hit Isis strongholds.
But on Capitol Hill, Congress wants a say in that.