A woman is murdered in the restroom of a restaurant answer

Riddle: A woman is murdered in the restroom of a restaurant, Can u looked at the picture and find who the killer?

Answer: The correct answer is 4.

It’s 4 his knife is gone and his shirt is ripped that’s a piece of his shirt laying on the floor. it looks like blood but it’s a piece of his redshirt cause the blood is at the top of her and it never dropped down to the floor in that area so it’s not blood it’s his redshirt