This story will be updated. Alabama inmate Jeffery Lee was executed Thursday for the 1998 murders of Jimmy Ellis—a world-renowned Elvis impersonator—and Ellis’ ex-wife Elaine Thompson. He had also been charged with the attempted murder of Helen King.

Jeffery Lee’s case has grappled with questions in Alabama about emerging execution methods and an abandoned sentencing practice that sent him and others to death row.

Alabama can't execute 49-year-old Jeffery Lee with his originally chosen method of nitrogen gas, but it plans to move ahead with his execution on Thursday night all the same using lethal injection. NBC News sees Lee's case as a test of what it means when a state promises not to use a particular execution method,

This story will be updated throughout the day. Jeffrey Lee is scheduled to be executed tonight by the state of Alabama after 26 years on death row - unless a court or Gov. Kay Ivey intervenes. Lee, 49,

Calls are growing to halt an Alabama execution scheduled for Thursday.