A nearly 20-year-old control panel malfunction is believed to be the cause for a Graves County Jail inmate’s escape Sunday morning.

Jailer George Workman told WPSD Local 6 Wednesday that following an internal investigation he believes the malfunction caused a storage door to unlock.

According to Workman, Darius Harrison was reportedly in the jail kitchen when he heard a noise that the storage room door had unlocked. Harrison, 26, of Mayfield left through the door, which led outside. Workman said jail deputies realized Harrison had left but could not apprehend him.

Taking responsibility for the incident, Workman said the jail performs cell checks every 45 minutes, which are more frequent than state requirements, to make sure all doors are secure. He also told the TV station that deputies had checked the door inside and outside after an earlier signal indicated the door was open. Later, however, another signal indicated the door was open again and that was when Harrison escaped.

The jail has since installed a new control board.

Harrison had been accused of an armed robbery of a local convenience store. Lawn enforcement and dogs were used to search for him following the escape.

Anyone with information on Harrison’s location should contact Graves County Sheriff’s Office, Mayfield Police or Kentucky State Police.