The suspect was a woman.
A woman young enough to pass off as a delivery girl. Delivery agents of most restaurants were teens and for her to pass off as a teenager, this killer was probably very young.
However she wasn't a teenager, she was older, maybe around Twenty-two or three.
Bree didn't stay back to ask about the real person who was supposed to make that delivery, she guessed the killer probably jumped him somewhere without him even seeing her shadow.
Bree had built a kind of profile on this woman, she was skilled, vengeful and very rigorous.
For her to pull off such a lurid murder, she couldn't be a teenager nor could she be averagely skilled in combat.
Bree thanked the rude woman and walked out of the restaurant.