TV shows love to kill off major characters. Its a big trend in what has been called the golden age of television. But when it comes to It's Always Sunny in Philadelphia, one of the longest running live-action sitcoms in history, everyone though Danny Devito's Frank would be the first to go. That might not be the case. As it seems Dennis' days may be nummbers. Though, perhaps, they will let him live to return another day.

Last week, we reported that It's Always Sunny in Philadelphia star, co-creator and producer Glenn Howerton had signed on to star alongside Patton Oswalt in a new untitled NBC comedy series that was previously entitled AP Bio. At the time, it wasn't clear if the star was leaving the FX series he helped create, but given the surprising events of the Season 12 finale, which aired just a day before the news of Glenn Howerton's casting broke, many wondered if both the events of the finale and this casting, means that Glenn Howerton, who plays Dennis on the hit comedy series, is leaving the show. It turns out that the actor/writer/producer isn't quite sure what is happening quite yet. But his departure is possible. If you haven't watched the Season 12 finale of It's Always Sunny in Philadelphia, there will be SPOILERS below, so read on at your own risk.

RELATED: It's Always Sunny in Philadelphia Gang Will Begin Writing Season 15 in 3 Weeks

The Always Sunny Season 12 finale featured a number of surprising revelations, including Charlie (Charlie Day) finally getting to sleep with the Waitress (Mary Elizabeth Ellis), to give her the baby she won't be able to have otherwise. The episode also featured Glenn Howerton's Dennis being confronted by the son he fathered, following the events of the Season 10 episode "The Gang Beats Boggs," and his mother, with the finale ending on a poignant note. Dennis has an epiphany about his awful ways and decides to leave town, declaring, "I can't do any of this s--t anymore." A day after the finale aired, but before the news of Glenn Howerton's pilot casting was announced, Uproxx spoke with Glenn Howerton, asking the actor if he is actually done with the series. Here's what he had to say below.

"So... it's a little complicated. I may seem a little bit evasive here, and I don't mean to. It's not entirely certain whether I am or am not. I might be. I might be, but I might not be. That really is the truth. Just to be clear, to dispel any potential weirdness, it has nothing to do with my relationship to anyone on the show or Rob or Charlie or anyone like that. It's partially a creative and personal decision. We may be taking an extended hiatus between season 12 and season 13. So I'm certainly staying open to the possibility of doing more, but there is a possibility that I will not."

The show has already been renewed for two more seasons, and the interviewer even admitted that he only asked Glenn Howerton if he was leaving the show out of a sense of "journalistic thoroughness," and that he did not expect him to actually be leaving the show. The original report about Glenn Howerton's casting mentioned how this was much different that the situation of another Always Sunny cast member, Kaitlin Olson, whose hit new Fox series The Mick has already been picked up for a second season. Since FX and Fox are part of the same corporate entity, the actress can pull double-duty on both shows, but it could be a much more complicated situation if NBC picks up Glenn Howerton's new series. The site speculates that this extended hiatus may help create a gap in Glenn Howerton's schedule that would enable him to shoot both Always Sunny and this untitled comedy, if it's given a series order.

Glenn Howerton's interview is also the first we've heard of an "extended hiatus" between Season 12 and Season 13 of Always Sunny, and it isn't clear how long this hiatus could last. The rest of the Paddy's Pub gang has been keeping plenty busy as well, with Charlie Day starring on the big screen with Ice Cub in Fist Fight, while Rob McElhenny, whose character Mac also came out as a homosexual in Season 12, has also signed on to make his feature directorial debut with the Minecraft movie. There have also been reports that Danny DeVito is quitting the show. FX hasn't announced when Season 13 of It's Always Sunny in Philadelphia will air, but it seems that won't be happening for quite some time.