Police say Maira Coronel, 21, died after being shot on Halloween night while trick-or-treating with her twin sister and her two nieces.
Her killer is still on the loose.
The gruesome murder took place in a park on Chicago’s northwest side.
Authorities say she was in a parked car with her sister and young nieces when a masked gunman jumped into the back seat.
The man ordered them to start driving and demanded cash and their cell phones.
They gave him $40, but when Maira refused to hand over her phone, the gunman fired two bullets into the back of her head and jumped out of the car.
Authorities are asking anyone with information to come forward to help them find the gunman.