An inmate serving time for homicide killed a corrections officer Wednesday afternoon in Stillwater prison, marking the first such death of an on-duty Minnesota prison guard.
The attack occurred about 1:30 p.m. in an industry building and prompted a temporary lockdown of all state prisons, according to the state Department of Corrections.
Officer Joseph B. Gomm, who had celebrated 16 years on the job Tuesday, was taken to Regions Hospital in St. Paul, where he died of his injuries.
"Joseph gave the ultimate sacrifice while working to protect the citizens of Minnesota," said Corrections Commissioner Tom Roy, who declined to name the attacker.
A relative identified the inmate as Edward Muhammad Johnson, who is serving a nearly 29-year sentence for second-degree murder. After Wednesday's assault, he was transferred to Oak Park Heights, the state's only Level 5 maximum-security prison.
In a news conference, Roy said a weapon was used to kill the 45-year-old officer from Blaine. He did not disclose the type of weapon, but sources told the Star Tribune that Gomm was stabbed before being bludgeoned with a hammer.
Johnson, 42, was convicted in 2003 of stabbing his roommate, 22-year-old paralegal Brooke Thompson, to death while her 5-year-old daughter was nearby.
His parents, both Chicago police officers, died in a 1988 murder-suicide. Johnson was 12 when he watched his father shoot his mother eight times in their home shortly after she filed for divorce, according to the Chicago Tribune.