I have mixed emotions about that sign.
I think it is an act of kindness for anyone to go to the memorial and write that Evelyn was loved, even by strangers. However, I think it's too strident and too soon to say "killed by family." I know what I believe happened, as do we all, but still they are innocent until proven guilty under the law. Also, there are likely some extended family members who are genuinely innocent, and are grieving right now.
After, if any family members are convicted, those signs can go up all day long. JMO.