OKLAHOMA CITY (AP) — An Oklahoma group dedicated to improving the relationship between Muslims and the United States has issued a statement condemning the killing of an American oil worker with Oklahoma ties.

A militant organization allied with the Islamic State group has claimed responsibility for killing William Henderson. A lawyer for Henderson's estate said the Apache Corp. worker grew up in Enid and Garber.

The Oklahoma chapter of the Council on American-Islamic Relations condemned the killing, saying it disavowed a theology "that produces such inhumane actions." The group offered condolences to Henderson's family.

In August, the Enid News & Eagle Oklahoma published an obituary for a man named William Henderson, saying he had "passed suddenly" in Egypt. It said he had worked for Apache for 28 years.