Prison stabbing death being investigated as..... homicide

Officials from the California Department of Corrections and Rehabilitation are investigating the death of an inmate at Kern Valley State Prison as a homicide, the department announced Saturday. 

According to a CDCR release, two prisoners allegedly attacked another prisoner, identified as 41-year-old Isaac Duran, with an inmate-manufactured weapon at 2:55 p.m. on Oct. 14.

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Gee, I wonder what tipped them off that it just might be a murder?