A death row inmate in Louisiana who is scheduled to become the first person in the state to be executed using nitrogen gas has asked for his capital punishment to be carried out using a more “humane” method.

A death row inmate slated to become the first person to be put to death by nitrogen gas in Louisiana is seeking to halt the execution, citing constitutional concerns over the controversial killing method.

Louisiana's nitrogen gas execution protocol hasn't been released to the public. "It relates to the most solemn … government action that the government can take, which is to take somebody’s life," said the lawyer for Jessie Hoffman,

Hours after the nation’s first execution by nitrogen gas in January last year, Alabama's attorney general urged other states to also develop it as a method for carrying out death sentences. Now, some states are following suit.

Louisiana inmate Jessie Hoffman Jr. has argued the state's execution protocol is undisclosed and violates his constitutional rights

Christopher Sepulvado, 81, died Saturday at the Louisiana State Penitentiary in Angola, Louisiana, "from natural causes as a result of complications arising from his pre-existing medical conditions," according to the Louisiana Department of Public Safety and Corrections.

A court battle is gearing up over whether Louisiana’s execution protocol is a public record, in a case that could decide whether the state performs its first-ever execution by nitrogen

Louisiana death row inmate Christopher Sepulvado died Saturday his lawyers announced. He had been given an execution date in March.

Lawyers for Louisiana and death row inmate Jessie Hoffman Jr. have agreed to unseal the state's nitrogen gas execution protocol, which was being kept secret from the public until now.

Lawyers for Jessie Hoffman, a Louisiana death row inmate scheduled for execution on March 18, are asking a federal judge to halt his execution, arguing that the secrecy surrounding the state’s use of nitrogen hypoxia violates his constitutional rights.