You probably should stop your sentence with “I don’t think.” Then it would be accurate.
The African immigrant who was brutalizing homes in the area and brandishing knives at the occupants...and whose fingerprints and DNA were at the scene.... That’s who killed the poor girl.
That's crazy talk! Who could possibly think such a thing? A violent African male? It just makes no sense.
It was clearly Amanda Knox, a quiet, shy young woman on her school's Dean's List, who had no criminal past whatsoever, who decided one day to commit cold-blooded murder.