Officials say a crewman's body has been recovered after a tugboat capsized on the San Jacinto River near Houston.
Coast Guard Petty Officer 1st Class Andrew Kendrick said the man was unresponsive when located following Tuesday morning's wreck. Four other workers on board survived being dumped into the water.
Authorities are trying to determine what caused the Ricky J Leboeuf to flip. Kendrick said the accident does not appear related to recent heavy rain and flooding in the Houston area.
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Kendrick said the tugboat was working near barges when it overturned. Investigators are looking at whether the tugboat snagged a barge line and capsized.
The bottom of the overturned tug was barely visible in the water following the wreck.
The victim's name wasn't immediately released.