Layne Morris of Utah and Tabitha Speer of North Carolina filed their USD 44.7 million lawsuit in federal court in Utah on Friday.
The lawsuit cites a plea deal Omar Khadr signed in 2010 that he committed the crimes, including the killing of US soldier Christopher Speer. Khadr is now in Canada, serving the remainder of his sentence.
Khadr is suing the Canadian government for USD 20 million, alleging wrongful imprisonment.