i came across this post on tipofmytongue and am now trying to help this person find this short. here is the complete description from the post.
"Thinking about horror puppet/stop motion today has me wondering if I am experiencing memories of another earth. Do any of you remember this weirdly obscure TV episode from the 90s?
A Puppet or Stop Motion TV show episode about a guy who gets a job as an executioner. The execution chamber is weird, it like drops a person into the room, a loud speaker blares what they are guilty for, and then the executioner presses the button to incinerate them.
At first he has trouble getting I to the job, but the senior executioner says he will get used to it.
The guy eventually starts having problems with his wife because the job makes him a sociopath, or reveals that he is. So he finds a way to sneak her into the execution system and kills her.
It ends with him training the next executioner who has trouble at first, but he guides the new guy and creepily reassured him he will get used to it.
Not Twilight Zone or Tales from the Crypt. Possibly Sci-fi channel?
Similar in theme and form to this amazing creepy stop motion "Operator" by Sam Barnett [linked]