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.

Do Slade and Shado die in Arrow?

Shado was kidnapped by Edward Fyers and brought to Lian Yu as leverage against her father in order to make Yao Fei join Fyers' cause until Oliver and Slade rescued her. ... Shado was killed by Dr. Anthony Ivo on a quest to save Slade's life; her death was the main factor in Slade's vendetta against Oliver.

Is Slade Wilson in Arrow Season 7?

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