Update
Texas had been set to execute a convicted killer Tuesday evening, but a federal appeals court has put a stop to it.
Robert James Campbell's attorneys say they need time to make a case that he is mentally impaired and ineligible for the death penalty.
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Campbell would have been the first U.S. inmate executed since a failed execution in Oklahoma two weeks ago.
A condemned killer is trying to stop his Texas execution scheduled for tonight.
Robert James Campbell would be the first U.S. inmate put to death since the failed Oklahoma execution of Clayton Lockett, who died of a heart attack two weeks ago, after only one of a three-drug lethal injection was administered.
Campbell's attorneys argue that Lockett's delayed execution shows the inhumane pain and suffering death row prisoners can be subjected to.
Campbell kidnapped, robbed, raped and shot to death a woman in 1991.