A teenage driver in Connecticut is under arrest after authorities said the distraction of a handheld cellphone caused her to fatally hit a 44-year-old jogger. The victim’s father blames his death on “stupidity.’’ The death of Kenneth Dorsey in Norwalk and the subsequent criminal charges against the 16-year-old driver come as other states are considering measures to force both teenagers and adults to disconnect from cellphones and other electronic devices before getting behind the wheel.