Any mental health/hospice workers

Sorry this is so off base but I'm just a mess today. 2 weeks ago one of my patients killed himself. Today was my first day back at it and I got a call from  my former patients mom..she wants to talk with me. Clearly we both know that he was unstable due to years of drug use but this call just broke me. How do you talk to parents and not feel completely heartbroken? She will most likely want to know how our last session went and I'll of course be honest but I'm gonna have to tell her some awful things. He truly was dying mentally and the pain caught up to him. I just need to know how to not blame myself. Thanks😊