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Authorities say they suspect an inmate killed his cellmate at a San Bernardino County jail.

The San Gabriel Valley Tribune reports Monday that 31-year-old Ceasar Adrian Wilkinson was arrested last week for investigation into the murder of his cellmate at the West Valley Detention Center in Rancho Cucamonga.

Authorities say deputies received a report of a disturbance on Oct. 6 and found Jorge Antonio Diaz-Millan, 25, on the floor of a two-man cell. He was taken to a hospital where he died 10 days later.

Mara Rodriguez, a spokesperson for the San Bernardino County sheriff’s department, said Wilkinson had been in custody since September.

Online court records show Wilkinson pleaded no contest to assault likely to cause great bodily injury earlier on the same day the cell disturbance was reported. A message was left for an attorney who represented him in that case.

Diaz-Millan was arrested in September for investigation of attempted robbery, Rodriguez said.

The coroner’s office has not released the cause of death, according to the paper.