Mississippi has had four executions this year and has two scheduled this month.
Jan Michael Brawner is scheduled for execution Tuesday in the 2001 killings of his 3-year-old daughter, his ex-wife and her parents in Tate County.
Gary Carl Simmons Jr. is scheduled to die by injection June 20. He was convicted of shooting and dismembering a man in Pascagoula in 1996.
Mississippi has not executed more than four inmates in any single year since 1961, when five died in the gas chamber.
Some experts say the increase is because the inmates' appeals happened to run out around the same time and that it's not a lasting upward trend.