Still, I would say that Walgreen's should be sued for their failure to take appropriate action.

If employers were to know that they could be sued for liability if a worker has reported sexual harassment and they have done nothing about it, if someone is later physically harmed by the person who was reported, or if the person caused continued harassment after being reported and warned.

Yes, the man who killed her is responsible, but Walgreens enabled the conditions that made it possible and likely. So that makes THEM responsible, too.