Yes it was senseless.
Yes it is tragic.
But I believe that anger is a convenient replacement for sadness.
Let us mourn with her. Think of your own family, give them a call, give them a hug. Shed a tear or two.
Don't just be mad and angry. That is what the killer was.
Be sad, even if for a moment.
May Allah bless Jennifer and her sister to heal and be alright again...one day.