The San Luis Obispo County Sheriff's office says 57-year-old Joseph Dean Echavarria of Goleta died while dirt biking in rural Pozo on Sunday.
Deputies say family members called 911 after Echavarria became separated from them.
Deputies, a CHP helicopter and Cal Fire searched for the man in the Turkey Flats area off East Pozo Road and Queen Bee Road and discovered the man deceased.
The coroner's detective says the death appears to be from natural causes. An autopsy is scheduled for Wednesday to determine the cause of death.
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