COLUMBUS, Ohio — The Latest on a man convicted in an Ohio killing who faces execution next month (all times local):

2:30 p.m.

Lawyers for a man condemned to death in Ohio are asking the state's high court to delay the inmate's execution next month.

The attorneys cite a federal judge's finding that Ohio's three-drug injection process "will certainly or very likely cause him severe pain and needless suffering."

The attorneys filed the request Friday with the Ohio Supreme Court on behalf of death row inmate Warren Keith Henness.

The request came one hour after the Ohio Parole Board rejected Henness' request for mercy. Henness says he's innocent in the fatal shooting of a volunteer addiction counselor.

Henness is scheduled to die by lethal injection Feb. 13.

The judge's ruling questioned the constitutionality of Ohio's execution method but didn't stop the execution from going forward.

The state is expected to oppose the request.

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11:20 a.m.

The Ohio Parole Board has recommended against mercy for a condemned Ohio man who says he's innocent in the fatal shooting of a volunteer addiction counselor.

Warren Keith Henness is scheduled to die by lethal injection Feb. 13 at the Southern Ohio Correctional Facility in Lucasville.

Henness was convicted of killing 51-year-old Richard Meyers in Columbus in 1992. Authorities said Meyers had been helping Henness find drug treatment for his wife.

The Ohio Parole Board unanimously rejected Henness' clemency request Friday. Gov. Mike DeWine has the final say.

Henness' attorneys say two co-defendants provided the only evidence of his guilt. They also say his lawyer at the time didn't fully investigate the case ahead of trial.

Prosecutors say Henness is lying about his innocence.