ST. LOUIS (KTVI) – St. Louis Police are trying to determine whether two shootings in north city are related. Investigators say two men opened fire on three women in a home in the 700 block of Thrush at about 4:40 Sunday evening. Two were injured. One was killed. Hours later, four men wearing dark clothes opened fire on three men sitting on the front porch of a home on the same block. One man was shot in the back and leg. He is critical. Investigators say the victims knew the gunmen in the first incident, but not the second. At this point, they do not have a motive or suspect in custody.