Darkness Black Bear
Well, that was something alright. But still, he was the last person who the professor met and minutes after he left, he committed suicide. The cameras must have captured MC going in and coming out. The Police will definitely suspect him highly. Also that Xia chick, the professor's student. She doesn't seem to have a strong willpower, so it should be easy for the police to interrogate her and know that there was academic conflict between MC and Professor. So you have the 'motive' and the 'evidence'. With these facts alone, MC could be jailed.