An Oklahoma death row inmate whose execution was thwarted by President Joe Biden's administration, only for it to get the green light under President Donald Trump, is now set to die on Thursday.

John Hanson, 61, is set to be executed by lethal injection for killing 77-year-old Mary Agnes Bowles after he and another man carjacked and kidnapped her from a mall on Aug. 3, 1999. The men also killed a witness, Jerald Thurman.

"I can't change the past," Hanson said at a recent clemency board hearing asking for mercy. "I would if I could."

Hanson's execution will come the same week that he won a stay from a judge, only for it to be overturned by a higher court. If the execution moves forward as scheduled, it will be the 23rd in the U.S. this year and the third of four executions this week alone.

Here's what you need to know about the execution, including why Hanson's fate changed after Trump took office for the second time.