An Oklahoma man was charged Tuesday with first-degree murder in the beheading of a co-worker, but federal officials said they had found no links between him and Islamic extremist groups that have beheaded several Western hostages in the Middle East and North Africa in recent weeks.

The accused, Alton Nolen, 30, who worked on the production line of a food processing plant in Moore, Okla., remained in a hospital after being shot by the company’s chief operating officer, who is also a reserve deputy sheriff, the authorities said.

The attack Friday was apparently spurred by Mr. Nolen’s suspension from Vaughan Foods after an employee told supervisors that Mr. Nolen had made inflammatory statements about white people. Mr. Nolen is African-American.

Greg Mashburn, the district attorney for Cleveland County, where the attack occurred, said Mr. Nolen had used “some Arabic terms during the attack,” but did not specify the terms. Mr. Nolen is a recent convert to Islam.