As racer wrote in the OP, Caleb, racer, and I have eaten at this particular Duffy's multiple times over the last year and a half. Unless this happened before opening with only people inside complicit in the murder and knowing the physical layout of this restaurant, IMHO it would be a quite difficult for anyone to stage a murder in the women's bathroom without there being witnesses.
That's not to mention the unlikeliness of such a Hollywood-inspired scenario. But, yeah... the forensics of a suicide vs a homicide are quite distinct. I submit even the fantastical scenario of a "forced suicide" would be readily apparent to forensic investigators.
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