(CNN) Lawyers for Rodney Reed , the Texas inmate set to be executed next week, said in a legal filing that testimony from seven new witnesses help to prove his innocence.

Reed was sentenced to death more than 20 years ago for the 1996 assault, rape and strangling of 19-year-old Stacey Stites in Bastrop. But Reed and attorneys with the Innocence Project say they have evidence that exonerates him and instead implicates Stites' fiancé at the time, Jimmy Fennell, who was a police officer.

The case has drawn the attention of lawmakers, religious leaders and celebrities such as Kim Kardashian West and Rihanna , and more than 2.8 million people have signed a petition on freerodneyreed.com asking Gov. Greg Abbott to halt the execution, scheduled for November 20.

The new witness affidavits, which come from neighbors, colleagues, and associates of Stites and Fennell, paint their relationship as abusive and difficult. There is also additional testimony that underscores the assertion that Stites was engaged in an affair with Reed.

One witness attested that Fennell said something like, "You got what you deserved" while looking at Stites' body at her funeral service.

The new testimony aims to refute the prosecution's portrayal of Fennell and Stites as a happy couple eagerly anticipating their upcoming wedding and further cast Fennell as a potential suspect in his fiancée's murder.

Fennell was never charged in her death. His attorney, Robert Phillips, said his client denies any involvement in Stites' death, and he said the stories were lacking in credibility.

"There's no evidence that's worthy of presenting even to a grand jury that Jimmy Fennell was somehow involved," Phillips said.

The Innocence Project leads Reed's defense

The lead prosecutor for Reed's case maintains he is guilty and has said that DNA evidence from Stites' body proves it.

"A large amount of credible evidence, including irrefutable DNA evidence, the testimony of witnesses, and the pattern Rodney Reed followed in committing his other sexual assaults, show beyond a reasonable doubt that he raped and murdered Stacey Stites," Lisa Tanner said.

But Reed's attorneys say his DNA was on Stites' body because they were engaged in a consensual sexual relationship.

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The Innocence Project noted that Reed, who is black, was convicted by an all-white jury. The group also says the murder weapon was never tested for DNA evidence and that forensic experts admitted to errors in their testimony, and that a former prison inmate claims someone else confessed to the murder that sent Reed to prison.

Bryce Benjet, a senior staff attorney with the Innocence Project, called the case a "miscarriage of justice."

In 2008, Fennell pleaded guilty to charges of kidnapping and improper sexual activity with a person in custody while he was an officer in Georgetown, Texas. A woman he detained when he was responding to a domestic dispute call accused him of rape. He was sentenced to 10 years.

A former inmate who served time with Fennell said in an affidavit filed this month that Fennell confessed to killing Stites.

"Jimmy said his fiancée had been sleeping around with a black man behind his back," wrote Arthur Snow Jr., who was serving a sentence for forgery in a Texas prison in 2010, in the affidavit.

"Toward the end of the conversation Jimmy said confidently, 'I had to kill my n*****- loving fiancée,'" he wrote.