ST. PETERSBURG, Fla. \- A child was shot and killed on Friday, and police are on the scene investigating. According to police, officers responded at 12:15 p.m. to a house at 1421 43rd St. S. for a gunshot wound to a boy. Police say 11-year-old Amir Williams died at the scene from his injuries. Investigators say there was no school today, and Amir was home with his 14-year-old brother and 13-year-old sister. Read: Florida Sheriff Blasts Pittsburgh Judge Xander Orenstein, Calling Him A “Goober Smoocher” The 14-year-old brother admitted he was playing with the gun and accidentally shot his 11-yea…