THEY. Misgendering is at the very best ad-hominem, there is nothing about it that supports your ideas, it just makes you look like an asshole. Zoe is trans, even wikipedia uses their pronouns correctly. I hate Caitlyn Jenner but I don't frigging misgender her.
On "murder", do the math. They both got doxxed severely, and the one who get less hate died. There were clearly, obviously, mind-numbingly obviously factors besides their personal relationship. I say that AS a suicidal person. Who cares about the chat, Zoe got shat on by the whole damn internet for years. You can't in good faith minimize the harrassment against Zoe while overblowing the harrassment against Alec, pick a fucking position. Harrassment is either bad and deadly or it's not.
BUT FURTHER, their personal involvement in a private issue, while Zoe's treatment by the public is a public issue. It's not our job to decide if someone is guilty, but it IS our job not to do the same damn thing we just got done accusing others of.
If you'd rather not engage with their work or see them as a good person, that's your prerogative, but you keep it to your damn self.
Throwing around bullshit like "pathological liar" just makes you full of ableist nonsense.