A man died after a boat capsized in the breakwater off the Long Beach coast on Friday afternoon, fire officials said.
A marine distress signal went out at about 4:45 p.m. near Seal Beach, Brian Fisk of the Long Beach Fire Department said.
First responders arrived at the scene and rescued one man in his 50s who was taken to a hospital, according to Fisk.
The victim, who was unresponsive when pulled from the water, was soon pronounced dead, officials said.
The 21-foot-long boat was found overturned in the water, Fisk said.
Rescuers searched the area for other possible victims, but ultimately determined the lone victim was the only person onboard the vessel.
Firefighters believe the boat might have crashed into rocks and then overturned, but the incident was still under investigation.
Aerial video from Sky 5 showed rescue boats swarming the area around a vessel that appeared upside-down and almost submerged in the water.
No further details were immediately available.
KTLA's Matt Phillips and Brian Day contributed to this report.