The 58-year-old man was sitting by a 40-foot log north of the North Jetty near Driftwood Shores Resort with some family members.
Witnesses said the tide rushed in at about 6 p.m., knocking an elderly woman onto the sand. Officials said the Eugene man was trying to help his family member up when the receding water pushed the log on top of him.
An off-duty Eugene firefighter pulled the man to safety and started performing CPR, officials said. The man was taken to Peace Harbor Hospital, where he later died from his injuries.
The investigation is ongoing, and officials are asking the public to be careful while visiting the coast.
Sean Barrett, the Fire Marshal for Siuslaw Valley Fire & Rescue, says there are a few things people need to remember when you are visiting Oregon's beaches.
He says that you should never stand on logs near the water line or turn your back to the ocean. | More beach safety tips from Oregon Parks and Recreation Dept.
Barrett adds that you should never become complacent on the beach. He says just because it's nice outside, it doesn't mean the ocean will be nice.
This is a developing story and will be updated.