Inmate Craig Wissink, convicted of murder in 2004, is suspected in the Wednesday slaying of Sergeant Meggan Lee Callahan at Bertie Correctional Institution in Windsor, North Carolina.
Callahan, a 29-year-old with four years on the job, was assaulted around 5.30pm and died less than an hour later, despite lifesaving measures by fellow corrections officers, officials said.
Callahan 'was always smiling', but she lived alone and put in long hours at the prison, Nixon said. 'She worked all the time,' he said.
Wissink, 35, is serving a life sentence without parole in a 2000 home-invasion robbery that left one man dead of a shotgun blast to the chest, court records show.
He has had six prison infractions since 2013, including fighting, interfering with staff, substance possession and possession of banned electronic device, according to prison records.
The violent convict has also spent time practicing his artistic talents behind bars, winning first place in a 2008 drawing competition for inmates hosted by Vance Granville Community College.
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