I read this article earlier this morning - shocking that someone would use the identity of someone's deceased relative to troll them. Disgusting. But, also eye-opening inasmuch as that same person actually took responsibility and apologised, when confronted.
A friend of mine has suffered quite badly, recently - she's managed to inadvertently step on someone's toes (I know exactly what happened and while I won't go into it here, it was minor), and it seems that someone has reported all her social media accounts for "abuse" (totally wrongly), and even gone so far as to hack her and send abusive messages in her name to all sorts of professional contacts.
Fortunately, this person has a good reputation and none of this is likely to stick, but it's unbelievable the lengths some people will go to in order to put one over on somebody.