The missing man was identified as John R. "Buster" Johnson, 64, a husband and father of two, AL.com reported.
Winds up to 66 mph in the Mobile, Ala., area broke the Carnival cruise ship Triumph from its moorings Wednesday, causing it to drift into nearby vessels and structures at the BAE shipyard in the Mobile River, authorities said.
The winds caused a guard shack with two shipyard employees inside to blow into the water, CNN reported.
The Los Angeles Times reported the shack fell into the water because the cruise ship hit the pier on which the shack was located, causing the structure to collapse.
The Coast Guard said it found one of the workers, who was treated for mild hypothermia. After 15 hours of searching for Johnson, the Coast Guard called off the search Thursday, CNN reported.
Carnival spokeswoman Joyce Olivia said all 600 crew members and 200 contractors on the Triumph were accounted for and uninjured.
The cruise ship was docked in Mobile to undergo repairs after it was without power for five days during a February cruise with more than 4,000 people onboard.