ENID, Oklahoma - An Egyptian militant organization allied with the Islamic State group has claimed responsibility for the killing of an Enid man.

Ansar Beit al-Maqdis, which now calls itself the Sinai Province, said on its Twitter account late Sunday that it killed William Henderson, 58. It published pictures of his passport and two identification cards. It did not say when or how it killed him.

The passport said Henderson was from Texas and his ID cards said he worked for Texas-based energy company Apache Corp. and Qarun Petroleum Co., a joint venture with Egypt.

Apache said in August that one of its supervisors had been killed in an apparent carjacking in Egypt's Western Desert. The company did not identify the man.

The Enid News & Eagle published an obituary for a man named William Henderson in August, saying he had "passed suddenly" while working in Egypt. It said he had worked for Apache for 28 years and was 58 when he died.

The U.S. embassy declined to comment on the militant group's claim, and Apache could not immediately be reached for comment.

Monday, Stephen Jones, attorney for Henderson's estate, denounced his "senseless" murder "in cold blood in broad daylight." The statement said Henderson grew up in Enid and Garber, Oklahoma, and that he and his wife of more than three decades, Carol, have children and grandchildren. It said thousands had attended Henderson's funeral.

The Associated Press contributed to this report.