Rochester police are investigating a homicide at a liquor store near Highland Park. Officers responding to a customer's 9-1-1 call about a possible robbery found a woman in her 40s unresponsive late yesterday afternoon at Char's South Avenue Wine and Liquor. It is located in the 1400 block of South Avenue. Authorities say the woman had trauma to her upper body. Police haven't said if she worked there or a customer.