UPDATE (3:48 p.m.) - CA State Park rangers as well as CAL FIRE SLO officials responded to the off-highway vehicle (OHV) crash.
Park rangers said the crash happened in an approximately twenty foot dune near the area of Sand Highway 22.
Rangers said three men, all approximately 30 years of age, were involved in the crash.
One was pronounced dead on scene, the other two were transported to area hospitals.
The OHV was privately owned, according to officials.
The crash is still under investigation.
ORIGINAL (3:13 p.m.) - CAL FIRE SLO fire officials responded to a fatal ATV crash at the Oceano Dunes Saturday.
Fire officials say the rollover crash happened at around 12:21 p.m. near the dunes vent pipe area also known as Sand Highway 22.
According to CAL FIRE, a single ATV rolled over and three people were involved in the crash.
Fire officials say one person died, another was transported by air to Marian Regional Medical Center and another person was transported to the hospital by ambulance.
When first responders arrived they say one person was pinned under the ATV.
The cause of the crash is under investigation.
This is a developing story and will be updated when new information becomes available.