Do you know if your wife is taking medication for the Bipolar? Is she seeing a therapist? Are the three of you still going to the Bipolar group?

I am wondering if your wife sent you the voice mail of the threat because she knows what he is capable of and fears for her life?

One avenue that might be worth exploring is an involuntary commitment. There must be proof of a mental illness and a danger to herself or others. The Bipolar will suffice as the mental illness, especially if she is not taking medication. My thought is that arguably she is a danger to herself by staying in an abusive relationship. The voice mail may or may not be admissible at a hearing. Nonetheless, I think you may use it to bolster your petition to have her committed.

Commitment may only be a short term solution. Even so, it should accomplish two things. First, your wife will be reminded of the necessity of tending to the Bipolar. Second, there will be a court record of the voice mail threat.

I wish you well.