A former Oregon Department of Corrections prison guard was being held Sunday in the Polk County Jail in connection with a fatal shooting, authorities said.

Alonzo Rowell, 51, was arrested Saturday at the Oregon State Penitentiary, where he worked until last year. The name of the person who died has not yet been released by Dallas Police or the Polk County District Attorney’s Office.

After the shooting, Rowell apparently made his way to his former workplace, the prison in Salem, where he arrived with “potential intent to harm others,” according to an email that Corey Fhuere, the prison superintendent, sent agency employees. The prison, Oregon’s oldest, houses about 1,700 people.

Fhuere said multiple police agencies responded to the prison and arrested Rowell. Details surrounding the circumstances of his arrest were not immediately available. No one was injured, Fhuere said.

“I understand that hearing about this incident may be distressing, especially given Alonzo’s previous connection to our institution,” he wrote. “Please know that the safety and well-being of our staff and adults in custody remain our top priority.”

Earlier in the day, Dallas Police said they responded to a report of shots fired in the area of the 1400 block of SE Monmouth Cutoff Road. Police said they were not able to revive the person who died at the scene. Rowell knew the person, though police did not say how. The Department of Corrections said that person was not an employee of the agency.

Rowell is being held on allegations of murder, first-degree assault, unlawful use of a weapon and recklessly endangering another person.

Oregon Department of Public Safety Standards and Training records show Rowell was hired by the corrections agency in 1999 and continued to work there through April 2023. Records show he was on a leave of absence twice, once in 2014 and again in 2019. The circumstances surrounding his departure from the agency last year are unclear; corrections officials declined to comment Sunday.

In 2016, a Department of Public Safety Standards and Training committee decided not to revoke his corrections officer certification after he was convicted of recklessly endangering another person in 2015. Court records show he pleaded guilty in Polk County Circuit Court to recklessly firing a gun; he was sentenced to a year of probation.

The agency database lists his certification as inactive.