KAUA'I, Hawaii -- A 41-year-old Castro Valley man died Thursday while swimming in waters off Kapa'a on the island's east side, fire department officials announced.

On Friday, Kapa'a fire officials identified the man as Cristian Lung, of Castro Valley.

Fire crews responded to a call around 2:50 p.m. Thursday for a swimmer who appeared to be in distress in waters fronting a vacant lot next to the Plantation Hale Hotel in Kapa'a.

Bystanders were attempting to assist Lung when firefighters arrived on the scene. Firefighters assisted in bringing Lung, who was unresponsive, to shore and began performing CPR.

Medics then transported Lung to Wilcox Hospital, where he was pronounced dead.

This is Kaua'i's 11th reported drowning since the start of 2013, fire officials said.

The National Weather Service posted a high-surf warning for all north and west facing shores on the island until at least 6 a.m. Saturday. Large breaking waves, significant shore breaks and dangerous currents will make entering the water very hazardous.

Officials warn that anyone entering the water could face significant injury or death.

Contact Katie Nelson at 925-945-4782 or follow her at Twitter.com/katienelson210.