Why was she having an argument with the guy who killed her? He was a construction worker, so does that mean he was performing work for her? Why would she report his immigration status? Did she know he was illegal? Aren’t there a lot of unanswered questions here?
She rented a small apartment to use as an office, in order to write. He was renovating another apartment nearby, hammering away, and the noise disturbed her. They got into an argument about the noise, she threatened him with INS. That was his first story. The next story was, she discovered him trying to steal from her purse, and he panicked.
He’s the only one left to tell the story, so he can pick the one he wants.