Prison workers comfort each other after a news conference in front of the Anamosa State Penitentiary in Anamosa, Iowa, on Wednesday, March 24, 2021. Lorena Schulte, a nurse and Robert McFarland, a correctional officer were killed by an inmate in the infirmary during an escape attempt. An inmate was also injured in the assault. (Jim Slosiarek/The Gazette via AP)

A woman adjusts a sign next to memorials to the two prison staff who were killed near the steps to the administration building during a news conference in front of the Anamosa State Penitentiary in Anamosa, Iowa, on Wednesday, March 24, 2021. Lorena Schulte, a nurse and Robert McFarland, a correctional officer were killed by an inmate in the infirmary during an escape attempt. An inmate was also injured in the assault. (Jim Slosiarek/The Gazette via AP)

File-This Dec. 25, 2017, file photo shows Anamosa State Penitentiary in Anamosa, Iowa. A nurse and a correctional officer at the Anamosa State Penitentiary in eastern Iowa died Tuesday, March 23, 2021, after an inmate attacked multiple staff members and other inmates, state officials said. (Liz Martin/The Gazette via AP, File)

File-This Dec. 25, 2017, file photo shows Anamosa State Penitentiary in Anamosa, Iowa. A nurse and a correctional officer at the Anamosa State Penitentiary in eastern Iowa died Tuesday, March 23, 2021, after an inmate attacked multiple staff members and other inmates, state officials said. (Liz Martin/The Gazette via AP, File)

Flags are flown at half staff in memory of the two prison workers killed in an escape attempt at the Anamosa State Penitentiary in Anamosa, Iowa, on Wednesday, March 24, 2021. Lorena Schulte, a nurse and Robert McFarland, a correctional officer were killed by an inmate in the infirmary during an escape attempt. An inmate was also injured in the assault. (Jim Slosiarek/The Gazette via AP)

This photo provided by the Iowa Division of Criminal Investigation shows Thomas Woodard. Inmates Woodard and Michael Dutcher used hammers to attack prison staff members during a failed attempt to escape an Iowa prison, killing a nurse and correctional officer, kidnapping a third employee and severely injuring an inmate who intervened, authorities said Wednesday, March 24, 2021. (Iowa Division of Criminal Investigation via AP)

This photo provided by the Iowa Division of Criminal Investigation shows Michael Dutcher. Inmates Dutcher and Thomas Woodard used hammers to attack prison staff members during a failed attempt to escape an Iowa prison, killing a nurse and correctional officer, kidnapping a third employee and severely injuring an inmate who intervened, authorities said Wednesday, March 24, 2021. (Iowa Division of Criminal Investigation via AP)

File-This Dec. 25, 2017, file photo shows Anamosa State Penitentiary in Anamosa, Iowa. A nurse and a correctional officer at the Anamosa State Penitentiary in eastern Iowa died Tuesday, March 23, 2021, after an inmate attacked multiple staff members and other inmates, state officials said. (Liz Martin/The Gazette via AP, File)