CAHOKIA HEIGHTS, Ill., - Police are looking for a driver they say hit and killed two people in Cahokia Heights, Illinois, Sunday night, then walked away from his car. Authorities say a man and woman, both in their 50s, were carrying bags of items they'd just bought at a convenience store at Illinois Route 15 and Pocket Road when they were struck just before 7:30 p.m. “They had the whole street blocked off,” Monteneil Walker said. Walker was dr…