John Dowling, 66, was speaking with a student, identified by authorities only as Ali R., following a lecture when the 37-year old student fatally stabbed him 13 times in the throat and chest.

The suspect, who is set to be indicted for murder on Friday, told the authorities that, while he killed Dowling to defend his faith against a perceived slight, he has also long maintained a personal grudge against the lecturer, the Daily Mail reported Friday.

Government prosecutor Catherine Denis said that Ali has nurtured an ‘obsessive resentment’ against the university since it expelled him in September 2017.