Slade, along with every other residents of Earth-1, was killed in an antimatter wave that was sent by the Anti-Monitor on December 10, 2019. However, due to Oliver's sacrifice, he was resurrected on Earth-Prime.

What season does Slade Wilson die in Arrow?

In the opening minutes of Arrow's final episode, the show shifted gears back to a pivotal moment that changed the series forever. Back in Season 2, Episode 20, Slade murdered Moira in front of a bound Oliver by impaling her with his sword.

Is Slade Wilson in Arrow Season 7?

No, Slade Wilson (Manu Bennett) isn't returning for the final season.