Claudia J. Craig was a Starfleet officer assigned to the starship USS Voyager. She was an ensign who was killed in the line of duty sometime before 2377. Her name was visible on a casualty report of all who died during that vessel's journey through the Delta Quadrant. (VOY: "Imperfection")

This character was only mentioned in writing.
This name was devised for the list, it was not mentioned as a casualty in any other episode. It is possible this name refers to one of the officers killed en route when Voyager was dragged to the Delta Quadrant.
As with many names on the "Imperfection" list, C.J. Craig was an in-joke (albeit misspelled) referring to the character on The West Wing.
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