One sticking point I see with this question is that the "choragus" refers not to the dramatic Chorus but rather to the group of wealthy Athenian citizens who acted as producers for theatrical productions, which were always related to state religious holidays and performed as part of highly competitive--and highly lucrative--festivals. The play that won would receive quite a monetary reward that would be given to--the choragus: choagus is plural for choragi: wealthy citizens who paid the cost of productions including the hiring, costuming, and salaries of the Chorus. I find no alternative definition or usage for choragus.
Therefore, if the choragus were to say something to Jocasta after her suicide, it would probably be along the lines of: "Your performance was weak. Don't peek after killing yourself. Next performance get your wig on straight. You're on again for tomorrow's matinee. Break a leg!"
If what you actually mean is something like, "What would the Chorus Leader say to Jocasta afterward?" (aside from the tricky semantics thing of her suicide making it impossible to say anything to her), then it would be something reflecting the last thing he said to her and the next significant thing he said after her death; these things are:
CHORUS LEADER: Why has the queen rushed off, Oedipus,
so full of grief? I fear a disastrous storm
will soon break through her silence.
CHORUS LEADER: An awful fate for human eyes to witness,
an appalling sight—the worst I’ve ever seen.
O you poor man, what madness came on you?
What eternal force pounced on your life
and, springing further than the longest leap,
brought you this awful doom? Alas! Alas!
In these comments, the Chorus leader shows real understanding and compassion and sympathy. Therefore he would not say anything judgemental; he would not say anything dismissive nor condemning. He may say something like the following after his line that says:
CHORUS LEADER: That poor unhappy lady! How did she die?
"Sad Jocasta, mother of torn and sorrowful heart, with pain to the full as no other has felt. Woe drove her to her rest. Love drove her to her doom. Honor the beloved Queen, who sleeps now in quiet gloom."