My first thought as well.
What is even weirder is that one of the maids that went home knew about the money that was supposed to be made in the morning and how much it was. How did she know about that?
You may tell a maid that you are expecting an important package in the morning and to bring it to you as soon as it was delivered but would you tell her what it was? Lots of questions.
Now today I read that the perp was a former employee, an immigrant from Guyana and had served in the marines for a short time before being discharged for medical reasons. He had a long long rap sheet.