One prison staffer has been fired and another was suspended without pay after an investigation showed complacency among Arkansas Department of Correction staff led to the escape of an inmate who was previously convicted of killing a teenage girl and stuffing her body in a barrel.

Arkansas Department of Correction Director Wendy Kelley said Monday that the investigation into 40-year-old Lloyd Jones' June 13 escape shows several staff mistakes. Jones was on the run for three days.

Kelley says two guards and two construction officers were with a group of 16 inmates. Eventually, one guard ended up watching 13 inmates, and Jones saw an opportunity to escape. Kelley says the guard is facing disciplinary action as well.

Kelley says wardens will be instructed to review work assignments for certain inmates.