Lopez was a 23rd century Human man. He served in Starfleet as a security officer aboard the Federation starship USS Enterprise in the 2260s under the command of Captain James T. Kirk.
History
In 2269, Lopez and Sheckley joined Kirk, Spock and Leonard McCoy on the surface of an unnamed planet to search for a landing party that disappeared within an alien structure. When a doorway couldn't be found, Kirk asked Lopez and Sheckley to disintegrate a wall with phaser fire, but it was made of material that resisted phasers and blocked communications. Spock found a hidden entrance and assigned Lopez and Sheckley to maintain watch outside while Kirk, Spock and McCoy searched the interior. (TOS - The New Voyages 2 short story: "In the Maze")
Lopez was killed aboard the Enterprise later that year when a massive surge blew apart a power regulator matix in a Jefferies tube above the brig where he was guarding Tormid. A heavy panel struck him, breaking his neck, and he died instantly. (TOS novel: The Latter Fire)
