Texas inmate scheduled for execution for killing 2 stepsons

HUNTSVILLE, Texas (AP) — A Texas inmate who says he's intellectually disabled was set to be executed Wednesday evening for fatally stabbing his two stepsons during an attack more than 12 years ago in their North Texas home that also killed his wife.

Robert Sparks, 45, is facing lethal injection for the September 2007 slayings of 9-year-old Harold Sublet and 10-year-old Raekwon Agnew in their Dallas home.

Prosecutors say Sparks' attack began when he stabbed his wife, 30-year-old Chare Agnew, 18 times as she lay in her bed. Sparks then went into the boys' bedroom and separately took them into the kitchen, where he stabbed them. Raekwon was stabbed at least 45 times. Authorities say Sparks then raped his 12- and 14-year-old stepdaughters.

His attorneys are asking the U.S. Supreme Court to intervene, alleging his trial jury was improperly influenced because a bailiff wore a necktie with an image of a syringe that showed his support for the death penalty. Sparks also alleges a prosecution witness at his trial provided false testimony regarding his prison classification if a jury chose life without parole rather than a death sentence.

Lower courts and the Texas Board of Pardons and Paroles have turned down requests by Sparks' attorneys to stop his execution.

If the execution happens, Sparks would be the 16th inmate put to death this year in the U.S. and the seventh in Texas. Seven more executions are scheduled in Texas this year.

On Tuesday, the 5th U.S. Circuit Court of Appeals declined to stop his execution on claims he's intellectually disabled, saying his attorneys had not presented sufficient evidence to show Sparks is mentally disabled and had failed to raise such a claim in a timely manner.

In August, the 5th Circuit did grant a stay for Dexter Johnson, another Texas death row inmate who also claims he is intellectually disabled. In that case, the appeals court ruled Johnson had made a sufficient showing of possible intellectual disability that needed further review.

After his arrest, Sparks told police he fatally stabbed his wife and stepsons because he believed they were trying to poison him. Sparks told a psychologist that a voice told him "to kill them because they were trying to kill me."

Sparks' lawyers have argued he suffers from severe mental illness and has been diagnosed as a delusional psychotic and with schizoaffective disorder, a condition characterized by hallucinations.

A psychologist hired by Sparks' attorneys said in an affidavit this month that Sparks "meets full criteria for a diagnosis of" intellectual disability.

"Without a stay of execution, it is likely that Texas will execute an intellectually disabled man," Seth Kretzer and Jonathan Landers, Sparks' appellate attorneys, wrote last month in court documents.