I think the timing is key. Whatever happened was related to her leaving for Florida in a few days. It had to happen when it did or it was too late. Whether that was murder suicide or a double murder. That means Honey was as much a target as Barry. Otherwise it could have waited until she left.
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So who would know she was going to Florida besides her kids? The staff, Barry mentioning it to someone in his business? Also wonder what his CEO who's girlfriend worked as a whistleblower at Teva thinks about all of this. He must be in a state of shock.