The unidentified officer was terminated from his job on Friday night for multiple policy and procedure violations, the Waukegan Police Department said in a statement, three days after the incident left 19-year-old Marcellis Stinnette dead and his girlfriend Tafarra Williams wounded.

Some 200 to 300 people were expected to hold a demonstration calling for justice on Saturday in the city of 85,000 people in Lake County about 45 miles (72km) north of Chicago, according to Clyde McLemore, a local organiser...