According to a foreign news agency, the culprit of the murder in the US state of Alabama was sentenced to death by nitrogen gas.
According to the report, nitrogen gas was released in a mask wearing a culprit in Alabama.
The Attorney General says Smith was declared dead in less than 40 minutes.
According to the news agency, Smith was sentenced to death for killing the wife of a preacher in 1989.
It is to be noted that the death sentence of nitrogen gas has been approved in the US states of Alabama, Okla Hama and Masiyap, while the UN Human Rights Commission has declared the death penalty from nitrogen gas as inhumane.