Ensign O'Herlihy was a male Human Starfleet officer who lived during the mid-23rd century. He served in the operations division aboard the USS Enterprise under Captain James T. Kirk as one of the ship's ordnance officers.
In 2267, O'Herlihy was one of three tactical aides, including Lang and Kelowitz, who beamed to an Earth observation outpost on Cestus III. Upon arriving, they discovered the colony had been destroyed by the Gorn, a previously unknown species. O'Herlihy was ordered by Captain Kirk to stay with him. Moments after discovering the position of the attackers, however, O'Herlihy was killed by disruptor fire. (TOS: "Arena")
|Tactical officers of the starships Enterprise|
|Enterprise NX-01:||Alex • Billy • Reed • Unnamed • Greer|
|USS Enterprise:||Kelowitz • Lang • O'Herlihy • Chekov (post refit)|
|USS Enterprise-D:||Armstrong • Bailey • Barnaby • Burke • Hayes • Kellogg • McDowell • Rainer • Smith • Taitt • Williams • Worf • Yar • Unnamed • Crusher • Gaines|
|USS Enterprise-E:||Armstrong • Daniels • Kelly • Worf|
|ISS Enterprise NX-01:||Reed • Unnamed|