>> live from the cbs broadcast center in philadelphia, this is cbs3 "eyewitness news". >> well, tonight at 6 o'clock, a toddler in delaware county is shot and killed and now police are investigating the tragic circumstances. >>> plus, the man who allegedly stabbed a philadelphia city councilman is now under arrest. what david oh is telling us about the man he says delivered the blows just days ago. good evening, i'm natasha brown. thank you so much for joining us. we begin tonight with the developing story about this toddler shot and killed on the 2900 block of bethel road in chester township delaware county and that is where we find "eyewitness news" reporter alycia nieves. >> reporter: authorities confirm a three-year-old boy died from a gunshot wound here police actually just cleared the scene a few minutes ago leaving with evidence bags. inside one of those evidence bags we're told a 9-millimeter gun, the gun in that fatally wounded the three-year-old boy inside this home and...