We haven't talked about it explicitly, but he knows.
[Bruno is incredibly good at reading people. There have been enough serious conversations between Bruno and Jotaro to have noticed the ways in which he backs off the topic of death around Bruno. There are, of course, personal things he doesn't want to consider, but his gaze will suddenly grow a little more averted and he fumbles around for something else to talk about. Like he doesn't want to risk offending Bruno by stating the obvious.]
[In Bruno's unwillingness to talk about, Jotaro's always able to change the subject.]
Kakyoin knows as well, if that's what you're about to ask.
[late night audio]
[Bruno is incredibly good at reading people. There have been enough serious conversations between Bruno and Jotaro to have noticed the ways in which he backs off the topic of death around Bruno. There are, of course, personal things he doesn't want to consider, but his gaze will suddenly grow a little more averted and he fumbles around for something else to talk about. Like he doesn't want to risk offending Bruno by stating the obvious.]
[In Bruno's unwillingness to talk about, Jotaro's always able to change the subject.]
Kakyoin knows as well, if that's what you're about to ask.