HS Trivia #2
The black queen is always killed by Jack across all games (where we know who killed her).
In the beta kids' session we see it on [S]Jack: Ascend

In the Alternian session we see it on [S]Cascade

In Caliborn's session we see him explaining how it will happen on page 6193

And in the Alpha kids' session we see Calliope joke about the black queen being "jacked" on page 5083

The only one instance we don't know about who killed the black queen is the beforan session.
(This trivia was going to be the fifth one but I have decided to end up being the second as a response to Intermission, here it is one of many chess people trivia I have in my limitless trivia chamber!)