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A convicted killer has died after an apparent fight in his cell at a Riverside County prison, authorities said Tuesday.

Henry Reyes, 44, died Monday at a hospital, two days after he was found bleeding and unconscious in his cell after an alert sounded at Ironwood State Prison in Blythe, east of Los Angeles, according to a statement from the California Department of Corrections and Rehabilitation.

Officers restrained Reyes’ cellmate and placed him in segregated housing pending an investigation, authorities said.

No weapons were found.

The cause of death is under investigation as a homicide.

Authorities said Reyes was sent to prison in 2014 from Los Angeles County and was serving life with the possibility of parole for first-degree murder, attempted murder and making a criminal threat to cause great bodily injury or death.

Ironwood State Prison houses about 2,700 inmates.