Jay Jones was a stuntman on The Original Series who doubled for James Doohan and played several doomed crewmen, including Jackson in Catspaw and Mallory in The Apple.
Jay Jones worked as a stunt performer on The Original Series in its second and third seasons and was the usual double for James Doohan, taking the violent throw backwards when Apollo strikes Scott in Who Mourns for Adonais?.
He also played a number of small roles, most of them short-lived. As Crewman Jackson he beams back from Pyris VII and topples dead from the transporter platform at the start of Catspaw. As Ensign Mallory in The Apple he is killed when he stumbles on an explosive rock, a stunt in which Jones was genuinely hurt by the charge.
In the third season he appeared as Mirt, one of the Troglyte miners who attack Kirk and Spock in The Cloud Minders.