I definitely think Hemy's wife wants to protect their assets before they are gobbled up by a criminal defense trial, but the fact that Rusty Sneiderman's wife was subpoenaed in this legal separation action - that right there tells me she thinks they were having an affair.
That said - I still haven't seen a lick of evidence that his wife was involved in his murder. Maybe she was, but so far, nothing has been released that allows us to make that connection.
Hemy left his wife a few weeks after he returned from that business trip with Andrea. Hemy was willing to leave his family, but Andrea hadn't left hers. Maybe Hemy was taking matters into his own hands when he decided to kill Rusty - hoping it would leave Andrea free to be with him.