Donaldson Correctional Facility in western Jefferson County was put on lockdown on Sunday morning after an incident that involved a convicted killer and at least one corrections officer.

“ADOC’s Law Enforcement Services Division (LESD) can confirm it is investigating a security incident that took place at Donaldson Correctional Facility in Bessemer, Alabama,” said a statement released by the Department of Corrections on Sunday morning. “Currently, the facility is on lockdown for the safety of the staff and the inmates, but there is no threat to the public. LESD is being assisted by the Alabama Law Enforcement Agency and the Jefferson County Sheriff’s Office.”

Soon after that statement, ADOC’s Law Enforcement Services Division announced it had arrested inmate Derrol Shaw and is working with the West Jefferson County District Attorney’s Office to expedite charges.

Shaw, 35, is already serving a sentence of life without parole for murder and robbery I out of Jefferson County.

In 2008, Shaw, then 20, agreed to plead guilty to four Birmingham murders.

Shaw was charged in the June 13, 2006, shooting deaths of John and Evelyn Martin, 84 and 82, and their 19-year-old grandson, Ryan Evans. He was also charged in the June 9, 2006, shooting death of Walter Hill, a 91-year-old church deacon. Shaw decided to plead guilty in all four murders to avoid a potential death sentence.