BASTROP COUNTY, Texas — The European Union is joining the call to stop the execution of a Central Texas death row inmate.

The EU tweeted a letter to Gov. Greg Abbott on Friday, asking Gov. Greg Abbott to grant Rodney Reed clemency.

Reed is convicted of the 1996 murder of Stacey Stites in Bastrop County. However, his supporters have maintained his innocence, saying key evidence, such as the murder weapon, has never been tested for DNA.

The letter said there is substantial doubt that Reed committed the crime.

The EU is asking the state to test DNA evidence linked to the case before executing Reed.

"Evidence in Mr. Reed's case casts substantial doubt as to his culpability. Moreover, Mr. Reed is seeking DNA testing of evidence that has not been previously tested," the letter said. "Under these circumstances, we believe the state should not proceed with the execution without allowing for those tests."

Last week, a former inmate submitted a sworn affidavit on behalf of Reed, claiming the fiance of States confessed to killing her.

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New Rodney Reed witness claims fiance bragged about murder

KVUE's 'Texas Crime Files' podcast on Rodney Reed case now available

According to an affidavit provided by our partners at the Austin American-Statesman, inmate Arthur Snow Jr. had a prison yard conversation with Stites' fiancé, Jimmy Fennell, around 2010. Snow said Fennell confidently confessed he killed Stites.

Snow is the fourth witness to come forward in recent weeks as Reed’s defense lawyers build a case against his scheduled Nov. 20 execution.

For more in-depth coverage, subscribe to KVUE's "Texas Crime Files" podcast on Reed's case. New episodes will drop every Wednesday until Nov. 20.

WATCH: New Rodney Reed witness says fiance killed Stacey Stites

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