Solidarity aside, whenever you are arraigned, any lawyer worth their salt will advise you to plead not guilty, because entering a guilty plea means it’s over, move on to sentencing, where you have no leverage at all.

You can always change a not guilty plea to a guilty plea later, if a plea deal offered by the prosecution is acceptable to you. This is especially relevant in a case where the death penalty is on the table, but also applies to the possibility of reduced charges or penalties in any case.

I’ll also add that this case could well end up with an Alford plea. In short, where the defendant asserts innocence, does not admit to the criminal act, but accepts the sentence because they believe that a jury would find them guilty based on the evidence. Again, this is definitely related to a case where the death penalty is on the table.