Why was carroll off the show during 2nd season of in heat night?

It seems you're asking about a show called "In Heat Night," but there is no known TV show with that name. It's possible you're thinking of a different show or misremembering the title.

Could you please double-check the name of the show or provide more context about it? Once I have the correct information, I can try to answer your question about why a character named "Carroll" was absent during the second season.