How would have Adam Lanza been in court if he didn't kill himself

Knowing how he was a shy person he probably wouldn't talk at all but what do you think?

He would most likely stay silent and refuse to make eye contact while staring at the floor. He might also display agitation due to his aversion to certain sensations such as bright lights or people speaking. I don’t know how anyone could envision him as anything but miserable. I wish more shooters fucked around in court though, you're getting a life sentence/death penalty anyways, might as well treat the trial like a joke.

Imagine if such a trial were held now and streamed online on YouTube, and what people would write in a chat looking at him

He'd stay silent and his attorney would make an insanity plea.
I imagine this defence could actually work to some extent for Lanza. Just the photos of the family home windows covered with black bags would make the jury question his mental state.
Then there would be professional mental health experts testifying in court.

Seeing as he self-reported psychotic episods in private messages on this foruym long before the massacre, that would be some good evidence.

Probably would have acted like Jeffrey Dahmer calm and personable, I can't imagine him trying to act insane or anything. He possibly would have gone on hunger strikes or attempt to kill himself similar to what James Holmes did, but I doubt he would do much.

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Extremely jittery

Probably very calm and silent.

I can't imagine Adam talking, or even saying a single word even a letter.