Both Heath and Sherry are missing.
It is unusual for a character to disappear with no closure.
Heath’s actor got a starring role in another series so they have parked him for now. That’s fairly common in soap operas which run forever and it gives the actors a way to work on other projects, allowing them to reappear when they finish up. Whether or not they ever do is up to the script writers and producers. Some people like to read the comics in order to speculate on what happens in the tv series but they don’t always follow each others storylines.
Same thing with Sherry. She is working on a movie so she may or may not be back later.