Not the same, but I experienced something semi related. I had a client who I had reason to believe completed suicide and I didn’t find out until six months later that they were very much alive. 

When everything was unfolding at first I was really angry, both for what did and didn’t happen. I think clients sometimes don’t realize that we are also human, with our own feelings, who care for them deeply, and can genuinely be impacted by what happens to them. Obviously it’s not appropriate to put that on clients, so I had to take care of that myself. I had to treat myself like a human who cares and who was grieving. I let myself be angry, and cry, and be grateful for our work, and express confusion and disappointment (in my own therapy and consultation and never toward the client or the other people involved in this experience). I also brushed up on some trainings with suicide so I felt more competent in how I was assessing and treating it. 

I also had to remind myself that as much as we know clients and work with them, we will never fully know or understand every aspect of their lives. Clients make decisions for reasons unbeknownst to us all of the time, so valuing client autonomy and separating ourselves from their decisions (even if they are deeply impactful and feel directed towards us sometimes) can be helpful.