Jerry Ayres played two short-lived Enterprise crewmen in The Original Series: Lieutenant O'Herlihy, vaporised by the Gorn in Arena, and Ensign Rizzo, a victim of the cloud creature in Obsession.
Jerry Ayres was an American television actor who twice played members of Kirk's landing parties who did not survive.
In Arena he is O'Herlihy, the tactical officer who beams down to Cestus III and is disintegrated by a Gorn weapon moments after the party comes under fire. In the second-season episode Obsession he is Ensign Rizzo, one of the security men attacked by the vampiric cloud creature on Argus X; Rizzo is carried back to sickbay drained of red blood cells and dies there after a second attack through the ventilation system.
Ayres later became familiar to daytime audiences through regular roles in American soap operas, including General Hospital.