Prison officials in Alabama have executed convicted murderer Carey Dale Grayson, marking the state's sixth death sentence and third using the nitrogen gas method so far this year.

An Alabama man convicted in the 1994 killing of a hitchhiker cursed at the prison warden and made obscene gestures with his hands shortly before he was put to death Thursday evening in the nation’s third execution using nitrogen gas.

An Alabama man convicted in the 1994 killing of a hitchhiker cursed at the prison warden and made obscene gestures with his hands shortly be

An Alabama man convicted in the 1994 killing of a female hitchhiker cursed at the prison warden and made obscene gestures before being put to death in the nation’s third execution using nitrogen gas.

Carey Dale Grayson, 50, fought his restraints and raised both middle fingers just before gas was administered, a witness said.

Alabama began using nitrogen gas earlier this year to carry out some executions. The method involves placing a respirator gas mask over the face to replace breathable air with pur