Nicholas Sheley, who killed a bunch of people in Illinois and Missouri, is expected to plead guilty to murder in Missouri today. This is his last trial, There have been others. He is serving several life sentences. His guilty plea today will remove the possibility of the death penalty.
The families of his victims are not happy. Why try him more than once if all you can manage is several life terms. He can, by the way, only serve one of those terms.