Missouri’s status as one of the most active death penalty states is about to change for one simple reason: The state is running out of inmates to execute.

A Missouri man has been executed for sexually assaulting and killing a 9-year-old girl, then dumping her body in a sinkhole outside of town.

Missouri’s governor has denied clemency for Christopher Collings, an inmate who is scheduled to be executed Tuesday for sexually assaulting and killing a 9-year-old girl.