Many people are arguing whether felicity is dead or just paralyzed in the new arrow episode "dark waters". I can surely explain she is sadly yet surely dead.
I think you can remember back in the beginning of season 4 of "arrow" Barry Allen (the flash) and Oliver Queen (the arrow) were attending a funeral. They are both linked in with the character known as felicity.
In the comics, Oliver is supposed to end up with Laurel Lance (the black canary). If felicity dies, this will be a perfect opportunity for Oliver to end up with the right girl, even if we don't want him to.