Kenneth Eugene Smith

The US state of Alabama carried out the execution of convicted murderer Kenneth Eugene Smith on Thursday using nitrogen gas.

Convicted murderer Kenneth Eugene Smith became the first man in the US to be executed with nitrogen gas, a controversial method that was condemned by human right activists as well as the United Nations and White House.

The southern US state of Alabama on Thursday put to death a convicted murderer using nitrogen gas. It's the first time the controversial method - criticised by human rights advocates - has been used in the country.

The US state of Alabama on Thursday used nitrogen gas to put to death a convicted murderer.

The US state of Alabama carried out the execution of convicted murderer Kenneth Eugene Smith on Thursday using nitrogen gas.

Convicted murderer Kenneth Eugene Smith became the first man in the US to be executed with nitrogen gas, a controversial method that was condemned by human right activists as well as the United Nations and White House.

The southern US state of Alabama on Thursday put to death a convicted murderer using nitrogen gas. It's the first time the controversial method - criticised by human rights advocates - has been used in the country.

The US state of Alabama on Thursday used nitrogen gas to put to death a convicted murderer.