Officials said the attack happened between 11:45 p.m. and 11:51 p.m.
The man was described as black, 18 to 20 years old, 5’8″ to 5’9″ tall, with a dark complexion. He had a short Afro with twists in the front, and a slim build. Officials said he was last seen wearing a black, hooded sweatshirt, and black Adidas jogging pants.
Police said the man was armed with a silver and black handgun.
If you have any information regarding this incident or this man, you are urged to call 414-935-7360.