A civil service mariner died late last month after tumbling 25 feet while performing maintenance aloft on the dry cargo ship William McLean, Navy officials confirmed this week.

Boatswain’s Mate Martin Anthony, 51, was working on the vessel on the morning of June 27 at the Detyens Shipyard in Charleston, South Carolina, when he fell and sustained fatal injuries, Military Sealift Command spokeswoman LaShawn Sykes said in an email.

A native of Guyana, Anthony became a civilian mariner with MSC in 2015 and was advanced to boatswain’s mate two days before his fatal fall, Sykes said.

Few other details were immediately available, and the cause of the accident remains under investigation.

The ship is in Charleston undergoing routine maintenance, Sykes added.