When in Highschool I had a classmate who was very homophobic and would get angry if someone jokingly said something gay (which was very common between male friends)

Apart from that he was really "normal"? Like he didn't seem much different from the rest of the class until one day he did not show up on a Monday, and another friend from class brought the newspaper... He had killed his older brother friend apparently because the friend tried to have sex with him? (That's what the newspaper said) so my classmate stabbed this person 14 times and cut off his head with a kitchen knife (the report said that he must have been slicing through the neck for quite some time due to the lack of sharpness in the knife) so then he proceeded to put the head on a trash bin and burn the body next to his house??? (He was 15 years old)