A 45-year-old man who was taken to a hospital in critical condition Sunday after bystanders found him floating unresponsive in waters off Mokuleia Sunday has died.

The Honolulu Medical Examiner’s Office identified him as Loyd Carroll of Waialua.

At about 3:30 p.m. Sunday, police and Emergency Medical Services said Carroll was participating in an ocean sport activity when bystanders found him floating unresponsive in waters fronting Crozier Loop.

A bystander brought him to shore and performed cardiopulmonary resuscitation until lifeguards and paramedics arrived. Emergency Medical Services administered advanced life support before transporting Carroll to a hospital where he died.

An autopsy is expected to be performed today to determine the exact cause of death.