MODESTO (CBS13) – Authorities have identified the sanitation worker killed in an accident in Riverbank on Monday.

The Stanislaus County Sheriff’s Department says he climbed up on the side of a garbage truck and was leaning over when the hydraulic arm closed in on him. It’s unclear how long he was trapped before first responders could arrive.

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Tuesday, the coroner’s office identified the worker as 30-year-old Modesto resident Ismael Martinez-Huertas.

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His exact cause of death was not released.

Because the incident is considered an industrial accident, the sheriff’s department says Cal/OSHA is taking over the investigation.

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The company Martinez-Huertas worked for, Gilton Solid Waste Management, has not returned calls for comment about the incident.