article_snippet.sent: Scroll down for video .
article_snippet.sent: The pause follows an infamous execution last ear, which saw officials struggle to administer a the poison to an inmate, who writhed on the gurney in pain for some 43 minutes before finally dying.
article_snippet.sent: State officials tried to halt the lethal injection after the inmate writhed on the gurney and moaned.
article_snippet.sent: He died 43 minutes after the process began.
highlights_snippet.sent: Chamber is pumped full of gas, and body dies from lack of oxygen .
  
highlights_snippet.sent: If gas execution is not available, state will use electric chair or firing squad .