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(CNN) - Douglas McAuthur McCain is not the only American killed while fighting for ISIS in recent days, a coalition of Syrian opposition groups said Wednesday.
A second American was killed in a battle with rival opposition groups as well, said the coalition, which calls itself the Nahrawan of Syria.
The coalition did not offer any evidence of a second American's death, but it released photos of McCain's body and his passport.
The California man has become part of the disturbing phenomenon of Americans joining terrorists who want to kill Americans.
McCain's family has been talking to CNN, and they seem blindsided by the news.
CNN's Pamela Brown reports.