In an episode full of tragic moments, the murder of Osgood in Death in Heaven was among the most brutal. The Master/Missy vaporised the UNIT scientist/knitware enthusiast/audience surrogate simply to mess with the Doctor.
Well, good news: despite Moffat denying it up and down, Oswald is on her way back. Earlier today it was confirmed that she’ll be back in series nine. But how?