On the morning of April 26, 2017, police found three men shot to death on the 4500 block of Rosewood Avenue in Pine Lawn, Missouri. Among the victims was 29-year-old Calvin Walker, discovered inside a black SUV; two others, Andrew Lee Green, 29, and 23-year-old Marquise Jamar Cooper, were found on a sidewalk and in a yard. All three were pronounced dead at the scene from apparent gunshot wounds.

The Major Case Squad of Greater St. Louis took over the investigation. Detectives publicized two vehicles of interest — an older white Chevrolet Impala with a black spotlight and a black Nissan Altima — and CrimeStoppers offered a reward that was later increased to up to $10,000. No suspects or arrests have been announced, and the investigation grew cold.

Calvin Walker’s mother, Vanita Walker, made public appeals for information, describing the family’s pain and need for answers. If anyone knew the victims, saw those vehicles, or has information about that April morning, can you help?