Thackery was a waiter at the Cabaret Of Magic in Now You See Him….
Thackery was the waiter that brought the Great Santini his evening brandy every night. While he was doing this, Santini would play a supposed magic trick on him. On the night that Santini murdered Jesse Jerome, he played a mind game on Thackery in which Thackery would guess a number and Santini would tell him to pick up an object that had his number in it, showing Santini's supposed magical ability to read minds. This was a part of Santini's alibi, however Lieutenant Columbo deduced that the trick was achieved by merely having all potential numbers on different objects and using a radio and microphone to make it sound as though Santini was physically in the room.
Thackery was played by George Sperdakos.