Morris was knifed once in the chest near a strip mall by his high school after being attacked by a group of teens in an apparent beef over a girl on Sept. 16, police said.
Morris knew the ex-boyfriend of a girl he had walked home from a party earlier in the week was trying to confront him, police said.
As he suffered from the stab wound, teens recorded him with their cellphones instead of offering help, police said at the time.