The solicit specifically mentions that the third law of Krakoa has been broken. This law is not 'Kill No Man'(which is the second law), but 'Respect This Sacred Land'. It is possible that this may be referring to the fact that he let the fabled 'pretender' step foot on their holy land.
The murder may be a completely unrelated event. It may even be referring to Gabby's death in New Mutants.