I meant to say that your analysis is very interesting and may have merit -- except, how would Gary get her gym bag?
Perhaps the same way this receipt got into her apartment, or this transaction was even made in the first place, or the same way he/persons for him, got into her apartment to sanitize it on 5/2 or other appropriate time after her death.
I do not think any of this would be much trouble for a congressman, especially if a few palms were crossed. How was it the landlord at the Newport refused to perform, or let others perform, a well-being check at her apartment until after the security tapes had rewound and rewritten over?