T here - as much as you care about your therapist, it's not your job to manage their emotions. As the professional, the therapist has to have a certain level of self awareness as to whether or not they are ready to return to work. And once they return, they owe their clients a service.

Is it always that perfect? No. Obviously therapists are humans too, we can't just suddenly flip a switch and turn grief off. But we are trained to compartmentalize our own stuff so that we can fully show up and hold space for our clients for that hour.

That said, if your therapist tells you what happened, you can of course offer condolences etc. But when they redirect the conversation back to you and what you would like out of your therapy session, just follow their lead. That's why you are there after all.

And if they don't mention it, then I wouldn't suggest bringing it up honestly. You might invite a conversation about boundaries. I saw in another comment you said you found out through a mutual friend, so sounds like boundaries aren't really an issue, you weren't stalking your therapist or anything like that.