A Texas appeals court on Tuesday halted the execution of a man who has spent more than 30 years on death row and had been set to die by lethal injection this week over the killings of six girls and young women found buried in the desert near El Paso.

David Wood, 67, was sentenced to death in 1992 for the killing of six woman and girls in El Paso, Texas. He has spent nearly 33 years on death row for the crimes.

State prosecutors withheld evidence favorable to Brittany Marlow Holberg during her 1998 murder trial that resulted in her being sentenced to death, a federal appellate court panel ruled Friday.

The federal appeals court said the prosecution failed to disclose that a key trial witness was a paid informant.

The Texas Court of Criminal Appeals did not clarify why it halted the execution of David Wood in its order granting the stay.

A federal appeals court has tossed an Amarillo woman’s death sentence after it found that local prosecutors had failed to reveal that their primary trial witness was a paid informant.

The order came just over 48 hours before David Leonard Wood was set to be executed by lethal injection on Thursday.

A death row inmate in Louisiana 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.