The next episode, 'Eleven-Fifty-Nine,' of Arrow, is going to be big one for fans as the mystery of the person in the grave will finally be revealed.

In a recent interview, showrunner Marc Guggenheim confirmed that the great mystery will indeed be resolved and someone is going to die in the episode.

Speaking to TVLine, Guggenheim revealed that the big reveal was on the cards and that the promos for the episode have made that kind of obvious. "I think promos have made it clear this is the episode you find out who's in the grave," Guggenheim said.

He went on to reveal that it was unofrtunate that they will be losing a character but it was a promise that they were finally following through on.

"We started off this year with the promise of a death," Guggenheim said, "and when we worked our way through our various creative choices, we realized that the thing that will give us the most pop going into the end of the season, into next season, unfortunately would be.." the character that will be leaving the stage.

At the same time, Guggenheim added that they were sensitive to deaths on the show and didn't just plan them to get high TRP's or as a cheap ploy to keep fans hooked.

"Arrow, much more so than Flash or Legends [of Tomorrow], traffics in death," Guggenheim notes. "We started off the series with the apparent death of Sara Lance and the actual death of Robert Queen, and a hero who murdered people. For better or for worse, death is part of the show. And what we're now finding is that the concept of death - as it should, by the way, when you are pushing into Season 5 - has to evolve, it has to change."

Here's the official synopsis:

"Oliver (Stephen Amell) and Diggle (David Ramsey) learn that Merlyn (John Barrowman) is going to try to break Darhk (guest star Neal McDonough) out of prison. Meanwhile, Laurel (Katie Cassidy) gets a surprising offer and Felicity (Emily Bett Rickards) has a heart-to-heart talk with Curtis (guest star Echo Kellum)."

The episode is set to air on April 6.

Watch the preview:

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Arrow, The cw, Television