We now know that it is beyond all reasonable doubt that Darwin (and Wallace) stole the entire theory of evolution by natural selection from its prior-published originator Patrick Matthew. You can't argue with that data -and that is plainly presented here in an exert peer reviewed science article. A timeline of Darwin's and Wallace great theft by fraud is here and the whole story can be read in my book (here).
Today we learn that Darwin's notebooks, including the one with his twig of life (it's not a tree), have been stolen from Cambridge University (here).
So the headline should really be "Theft of a Theft".
The concept of a tree of life heuristic device, used to explain evolution was certainly not Darwin's origination either. Karl Ernst von Baer 1826 had drawn one and published one years before Darwin replicated the idea. See
Brauckmann (2012) Image below thanks to Brauckman
here