Multiple realities
(covers information from several alternate timelines)
Mae Crosby was a 22nd century male Human Federation Starfleet officer who served in the sciences division on board the USS Franklin under the command of Captain Balthazar Edison in the 2160s. He later died when the starship crash-landed on the planet Altamid.
In 2263 of the alternate reality, Captain James T. Kirk and Commodore Paris, commander of Starbase Yorktown, closed the file on the missing crew of the Franklin with Crosby's picture being shown. (Star Trek Beyond)
Mae Crosby was played by an unknown actor.