Henry Graham, a 52-year-old man with a lengthy arrest record who killed a man with a single punch on the Magnificent Mile, was sentenced to nine years in prison on Friday, months after a judge found him guilty of involuntary manslaughter, saying state law barred him from being convicted of murder. The state’s “one punch” legal standard that spared Graham a murder conviction may surprise many, but it is well established in Illinois, where nearly a century of case law holds that a person cannot reasonably expect a single punch to kill someone. Therefore, in almost all cases, a person...