Naaah he's not the murderer

I’m a bit confused as well but I’m assuming that it’s smth like he’s been watching the prosecutor from a distance for a while or smth and “fell in love” as yaoi loves to do, so he wanted to meet him in person or smth like that?? Idk why it had to be with him getting caught instead of kidnapping the dude but hey it’s one trope over the other -shrugs-

Or he just wanna screw him over because of sum previous grudge or for fun lol