The Toronto man serving a life sentence for fatally stabbing Stefanie Rengel is facing an attempted murder charge following a violent clash at Millhaven Institution last month.
The Joint Forces Penitentiary Squad has charged David Bagshaw, 21, with attacking another inmate with a weapon on March 20.
The 34-year-old victim suffered severe, non-life-threatening injuries.
Mr. Bagshaw was shot by corrections officers during the bloody assault, but his injuries were also not life-threatening.
One inmate, who was shot in the chest, died of his injuries.
Mr. Bagshaw was just four days shy of his 18th birthday when he lured 14-year-old Stefanie Rengel from her Toronto home on New Year's Day 2008, stabbed her six times with a kitchen knife and left her to die in a snowbank.
A police investigation has determined that prison officers followed proper protocol during the violence at Millhaven.
The Joint Forces Penitentiary Squad, comprised of officers from the provincial police, Kingston police and RCMP, are still investigating.