NORTH CHICAGO --North Chicago police were involved in a fatal shooting at 15th and Jackson Tuesday.The relatives of the north suburban man killed in the police-involved shooting are demanding an explanation from authorities. It happened around 2 p.m. Aaren Gwinn's family says the 21-year old was unarmed when he was shot to death by police. He was allegedly in his car when officers opened fire. Gwinn's family says he has a 1-year-old daughter that will never get to know her father. North Chicago police and the Lake County Sheriff's Office are not releasing any details about the case.