The following personnel worked in the laboratory on Psi 2000.
This Psi 2000 engineer was found dead from the chaos caused by polywater intoxication. (TOS: "The Naked Time")
Phaser pistol shooter Edit
This Psi 2000 crewman was found dead with a phaser pistol in his hand, having "used the computer room as if it were an amusement gallery", according to Spock. (TOS: "The Naked Time")
This crewman was never seen.
A Psi 2000 scientist who suffered a bizarre death at the Psi 2000 laboratory was found by Commander Spock and Lieutenant Joe Tormolen. (TOS: "The Naked Time")
The scientist was "played" by a mannequin.
Shower man Edit
A Psi 2000 crewman was found frozen to death in a shower while fully clothed. (TOS: "The Naked Time")
This crewman is only mentioned in dialogue.