The U.S. Supreme Court granted a stay of execution for a Texas man 20 minutes before he was to receive a lethal injection Tuesday evening. The inmate has long maintained DNA testing would help prove he wasn’t responsible for the fatal stabbing of an 85-year-old woman during a home robbery decades ago.

The nation’s high court issued the indefinite stay shortly before inmate Ruben Gutierrez was to have been taken to the death chamber of a Huntsville prison.

Gutierrez was condemned for the 1998 killing of Escolastica Harrison at her home in Brownsville in Texas’ southern tip. Prosecutors said the killing of the mobile home park manager and retired teacher was part of an attempt to steal more than $600,000 she had hidden in her home because of her mistrust of banks.

Gutierrez has sought DNA testing that he claims would help prove he had no role in her death. His attorneys have said there’s no physical or forensic evidence connecting him to the killing. Two others also were charged in the case.

The high court’s brief order, released about 5:40 p.m. CDT, said its stay of execution would remain in effect until the justices decide whether they should review his appeal request. If the court denies the request, the execution reprieve would automatically be lifted.

Gutierrez, who had been set to die after 6 p.m. CDT, was in a holding cell near the death chamber when prison warden Kelly Strong advised him of the court’s intervention.

“He was visibly emotional,” prison spokeswoman Amanda Hernandez said, adding he was not expecting the court stay. “We asked him if he wanted to make a statement but he needed a minute.”

“He turned around to the back of the cell, covered his mouth. He was tearing up, speechless. He was shocked.”

She said Gutierrez then prayed with a prison chaplain and added: “God is great!”

Gutierrez has had several previous execution dates in recent years that have been delayed, including over issues related to having a spiritual adviser in the death chamber. In June 2020, Gutierrez was about an hour away from execution when he got a stay from the Supreme Court.

In the most recent appeal, Gutierrez’s attorneys had asked the Supreme Court to intervene, arguing Texas has denied his right under state law to post-conviction DNA testing that would show he would not have been eligible for the death penalty.