The U.S. Coast Guard has released the name of the Dutch Harbor crewmember who died Tuesday after becoming "seriously ill" just a day prior.

Coast Guard Petty Officer Shawn Eggert said Wednesday that the man has been identified as Petty Officer Second Class Michal Marciniak.

According to the Coast Guard's timeline of events, Marciniak sought treatment at an Unalaska clinic just after 2 a.m. Monday. He was diagnosed with a “serious illness” and was eventually medevaced to Anchorage by 10 a.m.

Marciniak received treatment at Alaska Regional Hospital until he died Tuesday morning around 6:40 a.m.

Marciniak was 30 years old and a native of Oak Lawn, Illinois. Eggert said he joined the Coast Guard in October 2007. He had been stationed in Alaska since May 2013, working with the Marine Safety Detachment in Dutch Harbor

Eggert said Marciniak's work involved safety examinations on fishing vessels and attending to pollution aboard vessels. The Coast Guard said Tuesday they do not believe his fatal illness was related to his work or any materials he may have come in contact with while on duty.

The Coast Guard will not release information on the man’s medical condition, symptoms, or cause of death until an autopsy is completed.

Marciniak's illness and death remain under investigation.