JACKSONVILLE, Fla. (AP) — The U.S. Supreme Court halted the execution of convicted child killer Mark Dean Schwab on Thursday, hours before he was scheduled to die.

The move by the high court was widely expected as it considers the appeals of two Kentucky inmates challenging the same lethal three-drug combination used in Florida. The court has blocked executions in three other states since accepting the Kentucky case Sept. 25.

Florida Attorney General Bill McCollum's office said it would not challenge the court's decision.

Vicki Rios-Martinez, the victim's mother, was unhappy with the court ruling.

"This is like 16 years ago. Today was the same kind of emotions, the same kind of chaos, the same kind of roller coaster ride," she said. "The system has disappointed us over and over and over again."

Schwab was sentenced to death for the murder of 11-year-old Junny Rios-Martinez