ST ANN, Mo. — St. Ann Police are investigating a triple homicide that happened late Monday evening. St. Ann Police Chief Aaron Jimenez told 5 On Your Side that police responded to a call of three people down in the 4100 block of Jane Avenue in St. Ann. Chief Jimenez said when police arrived, they discovered that three people had been shot to death in their home. Another child was injured and rushed to the hospital. Chief Jimenez tells us that the suspect is believed to be the children's stepfather.