Class 12 4 News Today

>> in americas most violent cities a young man is walking in the footsteps of a father he never knew trying to keep the peace. >> he was just sworn in as a chicago police officer 30 years after his father was gunned down in the line of duty. his bravery and dedication make this our "favorite story of the day." paul meinke of wls reports. >> reporter: on a wall in the lobby of the wentworth district station, hang photos of officers killed in the line of duty. larry vincent killed january 14, 1983...