5 p.m. update:

The death of Catlin Carithers is the second in the 30-year history of Corrections Corporation of America.

“Unfortunately, no system is immune to disturbances,” the company said in a statement. “This is a sad reminder of the challenges that come with providing this vital public service.”

The company has sent its critical incident stress management team to the facility to work with employees. The team includes crisis management experts and grief counselors.

CCA’s management and staff are working in partnership with the Federal Bureau of Investigation and law enforcement officials to investigate the cause of Sunday’s incident. The Adams County Sheriff’s Office is involved in that investigation.

“In partnership with the federal government, CCA Adams County Correctional adheres to the highest corrections standards and practices, and is independently accredited by the American Correctional Association — the national gold standard for professional correctional management services. The facility scored an impressive 99.5 percent on its most recent audit in 2010,” the CCA statement said. “CCA takes the safety and wellbeing of the inmates entrusted to our care very seriously. We have in place a robust grievance process, including an available toll-free number, through which inmates can share any concerns or complaints. We work to address these claims quickly and appropriately.”

9:30 a.m. update:

The Adams County Correctional Center has confirmed that Catlin Carithers, 24, of Meadville was killed Sunday night during a riot at the prison.

Carithers was a senior correctional officer who had worked with Corrections Corporation of America since 2009.

Carithers died from injuries sustained in an assault by inmates.

“Our deepest thoughts and prayers are with Mr. Carithers’ family, the extended family at the Adams County facility and the supportive members of the community in Natchez,” CCA President and CEO Damon Hininger said in a statement.

“It is often said in corrections that no matter how prepared we are — indeed, no matter how well-trained and experienced we become — nothing can brace us for the sobering loss of one of our own. Whether we are employees at the impacted facility or many miles away, we are all affected, saddened and, in ways both small and great, changed.”

Carithers was a 2006 graduate of Franklin County High School.

All prisoners at the Adams County Correctional Center are on lockdown this morning after the nine-hour riot left one employee dead and several others injured.

ACCC issued a press release this morning saying all prisoners had been accounted for, secured by staff and locked into their housing units by 2:45 a.m.

A total of 16 other employees were treated and released from hospitals.

Three inmates were treated at hospitals for injuries. One of those inmates has been returned to ACCC.

The prison staff are working today to assess the damage to the facility.

An investigation into how the riot occurred is ongoing. The Federal Bureau of Investigations and local law enforcement are assisting.

The prison’s release says Corrections Corporation of America will support full prosecution under the law for all inmates identified as having committed criminal acts during the disturbance.