A male victim Boston police said they believe is in his late teens was found fatally shot on Payson Avenue in Dorchester late Wednesday night.Officers found the victim at 11:15 p.m.He was rushed to an area hospital, where police said he was later pronounced dead.The victim’s identity was not immediately released and no arrests were announced.Police were asking anyone with information that could help their investigation to call homicide detectives at 617-343-4470.