An investigation is underway in California State Prison in Sacramento after an inmate was fatally shot by correctional officers.

On Friday at about 2:20 p.m.an inmate was attacked in one of the yards by two inmates with stabbing weapons. Correctional officers used 40mm direct impact rounds, pepper spray grenades and fired one warning round with a Ruger Mini-14 to stop the attack but it continued and another inmate joined in.

Two additional shots fired struck two inmates. Jamie Mardis, 38, was pronounced dead at the prison's medical unit.

The second inmate was transported to a nearby hospital and is in critical condition.

Mardis was sent to CDCR on July 26, 2012 from Kern County with an 11-year sentence for second degree robbery by a second striker. He received an additional two years for possession/ manufacture of a deadly weapon by a prisoner.