on wednesday we learne the driver of this gray mercedes, identified as karen carter hannah has been arrestedicular manslaughter. police said she killed the four-year-old and left the father with life-threatening injuries. she was making a righ from the center turn lane. >> it is horrible. our heart goes out to the family. we can' imagine what they feel like today. >> reporter: sfpd said to respect the family's request fo confidentiality. they are not identifying the victims. we kno they are not from the area. jod madero's runs walk sf, pedestrian safety group that wants design changes made to th intersection at fourth and king which she says has been identified as one of the city's most dangerous. >> we are about to watch a man in a wheelchair. >> reporter: sfpd officers were warning people to slow down as they turned onto the 280 on ramp. we saw countless examples of cars and trucks inching toward pedestrians. >> you just feel like you are taking your life in your hands, especially -- >> reporter: bettina, a longtim resident, says she goes out of her way to avoid the intersection all the ti