If the girl that died was black and the attacker is white, they would spin it for racism but since the attacker in this story is Mexican and illegal, they try to defer people away from his “illegal” status
Another thing they'll do after such an event is find a story that involves a "good" illegal immigrant and heavily publicize it.
This often occurs in the UK after a terrorist attack. The media start giving countless tales of Muslims who are helping with a charity or feeding the poor...etc.