Masada

Masada was a Starfleet officer, assigned to the USS Constellation (NCC-1017) as science officer in 2267.

Upon the arrival of the Constellation to system L-374, Masada reported the breakup of L-374 IV.

Later, when the Constellation encountered an extragalactic "planet killer," Masada was beamed down to L-374 III with the rest of the Constellation's complement by Commodore Matt Decker, and was killed when the device destroyed that planet. 

Background information
According to the, Masada was probably "named for the where Jews defied Roman legions, eventually committing suicide en masse rather than surrender."

Apocrypha
In several Pocket Books novels, Masada was named Guillermo Masada, and was a Starfleet lieutenant who was also Decker's second officer.

The USS Masada was a hijacked tug in Interplay's  game.''